Calculation comparison
Publish: 2021-05-08 10:49:42
1.
Graphics cards can't dig out bitcoin right now. Your calculation power is the calculation power of Ethereum. The calculation method is also wrong
2. In mathematics teaching, the accuracy of students' calculation has always been the main problem affecting students' performance. Many students always think that calculation problems are much easier than analytical application problems, and they have a solid knowledge of some rules and laws, so calculation is easy. Therefore, they are overconfident or unable to concentrate in calculation, and the results are full of mistakes, I pay special attention to the calculation practice. Strengthen the calculation practice, improve the calculation ability, so as to improve the performance of 20% of the students. In junior high school mathematics teaching, the topics related to the calculation content account for more than 55% of a test paper, Effectively improving the accuracy of calculation is a very important aspect of junior high school mathematics teaching.
the significance and importance of calculation.
1. Calculation is the cornerstone of learning mathematics. Mastering calculation opens the door to the kingdom of mathematics. In teaching practice, there is such a phenomenon: although many students master the calculation method, they often make mistakes in calculation, The accuracy rate of calculation is very low. It not only directly affects the learning effect of word problems and application problems, but also seriously hinders the improvement of students' mathematics performance. Therefore, we must improve the accuracy rate of students' calculation. 2. Number and calculation will accompany one's whole life. A person needs to learn all the mathematics knowledge when he is an alt in middle school, Second, the reasons for the low accuracy rate of calculation.
1. When students analyze the causes of wrong questions, they often make mistakes, such as "reading wrong questions and ing wrong ones", "writing scribbled and ambiguous", "not making draft when calculating, adding or subtracting one digit leads to wrong whole questions", It seems that most of the reasons are as follows: & quot; Carelessness & quot; What is the cause of "carelessness"? There are only two aspects: one is that students' psychological quality is not mature enough, the other is that they have not formed good study habits. Therefore, cultivating students' good study habits is not only the requirement of quality ecation, but also the premise of improving the calculation accuracy.
2. At the same time, some students' calculation accuracy is not very high, It also reflects that the computing ability of these students needs to be improved (for example, they are not familiar with multiplication formula, carry addition and so on); It may lack a good habit of calculation, such as the habit of checking calculation. Many students ignore the role of "estimation" in calculation. This may have something to do with our usual teaching practice.
Third, measures to improve the accuracy of calculation, It is very necessary to correct the calculation errors and improve the accuracy of calculation to cultivate students' good learning attitude and calculation habits, and then improve the quality of teaching.
2. Do a good job of demonstration and teaching by words and deeds. The teacher is the example of students. In class, the board performance is in line with the norms, so as to achieve both oral and personal teaching, Teachers who require students to do it must do it first.
3. Encourage and persevere constantly. It takes a long time to form a good habit of calculation. To make the strict requirements persist, students must be encouraged to recognize the strict requirements of teachers and keep a lasting interest in implementing the calculation specifications, Students: 1, in accordance with the general order of calculation. Make clear the meaning of the problem, observe the characteristics of the problem, determine the order of calculation. 2, to develop a good habit of serious calculation. Clear data, draft in accordance with a certain order. 3, can not blindly pursue high speed. Rather slow than wrong, rather less than excessive.
4, specific methods:
1, strict calculation process, Standardizing the calculation of draft is the guarantee to improve the accuracy of calculation. Students are required to have standard calculation format, neat and correct writing, and neat homework and test papers. Draft is a necessary means for correct mathematical calculation, and many calculation errors are caused by Scribble and disorder of draft. In teaching, draft also requires students to write neatly and orderly, and try to do oral calculation as much as possible, Students are required to make a draft according to their usual requirements. The paper can be folded in half, and the draft should correspond to the questions. This is concive to students' self review in an orderly way, and there is no need to spend more time rewriting the draft. It saves time and effort to check directly. It is concive to cultivating students' rigorous, meticulous, honest and serious homework habits, overcoming the bad habit of scribbling and littering drafts, and helping teachers find and analyze the causes of errors, To help students to correct and control the future teaching.
2. To make students form a good habit of calculation, we must be strict, careful and persistent; If there are nonstandard calculation errors in the test, we should give detailed comments and teach methods in class; Students with repeated errors should be given a "small stove". Self check and mutual check should be carried out on the implementation of calculation specifications, so as to cultivate students' rigorous style of study from time to time and everywhere. At the beginning, students should correct drafts in detail as they do homework, and students should correct mistakes in drafts seriously. When students graally develop the habit, they should change detailed ones into simple ones, and simple ones into random ones, To sum up, the formation of good calculation habits of students, first, strict requirements, strict training. Second, to teach students some methods to make calculation correct and effective. Third, to actively ecate and encourage students to establish the confidence that they will be able to calculate correctly in psychology, and strive to calculate correctly in behavior, Will be able to promote students to improve the accuracy of calculation
the significance and importance of calculation.
1. Calculation is the cornerstone of learning mathematics. Mastering calculation opens the door to the kingdom of mathematics. In teaching practice, there is such a phenomenon: although many students master the calculation method, they often make mistakes in calculation, The accuracy rate of calculation is very low. It not only directly affects the learning effect of word problems and application problems, but also seriously hinders the improvement of students' mathematics performance. Therefore, we must improve the accuracy rate of students' calculation. 2. Number and calculation will accompany one's whole life. A person needs to learn all the mathematics knowledge when he is an alt in middle school, Second, the reasons for the low accuracy rate of calculation.
1. When students analyze the causes of wrong questions, they often make mistakes, such as "reading wrong questions and ing wrong ones", "writing scribbled and ambiguous", "not making draft when calculating, adding or subtracting one digit leads to wrong whole questions", It seems that most of the reasons are as follows: & quot; Carelessness & quot; What is the cause of "carelessness"? There are only two aspects: one is that students' psychological quality is not mature enough, the other is that they have not formed good study habits. Therefore, cultivating students' good study habits is not only the requirement of quality ecation, but also the premise of improving the calculation accuracy.
2. At the same time, some students' calculation accuracy is not very high, It also reflects that the computing ability of these students needs to be improved (for example, they are not familiar with multiplication formula, carry addition and so on); It may lack a good habit of calculation, such as the habit of checking calculation. Many students ignore the role of "estimation" in calculation. This may have something to do with our usual teaching practice.
Third, measures to improve the accuracy of calculation, It is very necessary to correct the calculation errors and improve the accuracy of calculation to cultivate students' good learning attitude and calculation habits, and then improve the quality of teaching.
2. Do a good job of demonstration and teaching by words and deeds. The teacher is the example of students. In class, the board performance is in line with the norms, so as to achieve both oral and personal teaching, Teachers who require students to do it must do it first.
3. Encourage and persevere constantly. It takes a long time to form a good habit of calculation. To make the strict requirements persist, students must be encouraged to recognize the strict requirements of teachers and keep a lasting interest in implementing the calculation specifications, Students: 1, in accordance with the general order of calculation. Make clear the meaning of the problem, observe the characteristics of the problem, determine the order of calculation. 2, to develop a good habit of serious calculation. Clear data, draft in accordance with a certain order. 3, can not blindly pursue high speed. Rather slow than wrong, rather less than excessive.
4, specific methods:
1, strict calculation process, Standardizing the calculation of draft is the guarantee to improve the accuracy of calculation. Students are required to have standard calculation format, neat and correct writing, and neat homework and test papers. Draft is a necessary means for correct mathematical calculation, and many calculation errors are caused by Scribble and disorder of draft. In teaching, draft also requires students to write neatly and orderly, and try to do oral calculation as much as possible, Students are required to make a draft according to their usual requirements. The paper can be folded in half, and the draft should correspond to the questions. This is concive to students' self review in an orderly way, and there is no need to spend more time rewriting the draft. It saves time and effort to check directly. It is concive to cultivating students' rigorous, meticulous, honest and serious homework habits, overcoming the bad habit of scribbling and littering drafts, and helping teachers find and analyze the causes of errors, To help students to correct and control the future teaching.
2. To make students form a good habit of calculation, we must be strict, careful and persistent; If there are nonstandard calculation errors in the test, we should give detailed comments and teach methods in class; Students with repeated errors should be given a "small stove". Self check and mutual check should be carried out on the implementation of calculation specifications, so as to cultivate students' rigorous style of study from time to time and everywhere. At the beginning, students should correct drafts in detail as they do homework, and students should correct mistakes in drafts seriously. When students graally develop the habit, they should change detailed ones into simple ones, and simple ones into random ones, To sum up, the formation of good calculation habits of students, first, strict requirements, strict training. Second, to teach students some methods to make calculation correct and effective. Third, to actively ecate and encourage students to establish the confidence that they will be able to calculate correctly in psychology, and strive to calculate correctly in behavior, Will be able to promote students to improve the accuracy of calculation
3. 1、 Cultivate students' interest in calculation
simple calculation is often boring and students are easily bored. Therefore, according to the psychological characteristics of the lower grade students who are active and competitive, we can use a variety of training forms to replace the previous single form of practice. For example: training with games, competitions, etc; Driving trains, rushing to answer questions, breaking through barriers, etc. Various forms of training, not only stimulate students' interest in learning, but also make every student actively participate, so as to get twice the result with half the effort. Senior students can explain the principle of problem-solving more, let students understand the context of problem-solving ideas, know the reasons for this problem-solving, deepen the understanding, will improve interest< Second, pay attention to the training of oral arithmetic
oral calculation is the basis of written calculation, which requires not only accuracy but also speed. The formation of oral arithmetic skills and the improvement of speed can not be achieved by one or two days of training, but by constant training. In my opinion, the effect of mental arithmetic three minutes before class is very good. Before each class, prepare ten oral arithmetic questions for students to rush to answer, or let students write in a small book, check the answers in a unified way, make a summary every other time, and praise and reward the excellent students. The enthusiasm of students has been improved, and at the same time, they will pay attention to the correct rate. Of course, remember some common values, such as 2 π、 three π、 four π……， 112, 122, 132... And so on, which have a very good effect on speeding up the speed and accuracy of oral calculation< Third, strengthen the training of estimation
many problems in daily life don't need very accurate results, so we can use estimation to solve them. In this way, the speed is accelerated, and it does not affect the actual operation. When encountering such problems, let the students estimate as much as possible. In addition, even in the calculation of accurate results, the estimation will also play a monitoring role. Every time we finish a question, we can use the method of estimation to verify its correctness< 4. Pay attention to quick calculation and skillful calculation. Quick calculation and skillful calculation, that is, we usually say simple operation, the correct use of simple methods, on the one hand, can improve the speed of problem solving, on the other hand, can also make problem solving simple, improve students' self-confidence. The teacher can teach some basic laws first, let the students answer the questions, in the example of some calculation problems, let the students find the appropriate simple method. This requires students to have a clear grasp of the basic law of operation, especially the scope of its application. For example, multiplication has distributive law, but division does not. This requires students to divide by a number into its reciprocal, in the use of distribution law for calculation< 5. Develop good habits
we know that most of the time, students do not know how to calculate, but they wrong numbers, recite wrong multiplication formulas, or make mistakes in decimal points. These are tiny mistakes, but they often occur. Therefore, the usual practice should be strict, so that students develop a good habit of calculation. The first is to train students to be serious, meticulous, neat and standard. After careful calculation, we must emphasize checking calculation. There are many checking methods, such as checking step by step; It uses addition to check subtraction, multiplication to check division; Put it into the original question to check whether it is in line with the reality; It can also be checked by the above-mentioned estimation. Regular error correction training can also rece students' careless errors to a certain extent. Display the mistakes you are prone to make one by one, and compare them with your own reality. If you have them, you can correct them. If you don't have them, you will make fewer mistakes next time
in a word, computing teaching is a long-term and complex teaching process, and improving students' computing ability is not a matter overnight. Although the above points are not comprehensive, I believe that as long as we can seriously implement the above points, it will play a certain role in improving our computing power.
simple calculation is often boring and students are easily bored. Therefore, according to the psychological characteristics of the lower grade students who are active and competitive, we can use a variety of training forms to replace the previous single form of practice. For example: training with games, competitions, etc; Driving trains, rushing to answer questions, breaking through barriers, etc. Various forms of training, not only stimulate students' interest in learning, but also make every student actively participate, so as to get twice the result with half the effort. Senior students can explain the principle of problem-solving more, let students understand the context of problem-solving ideas, know the reasons for this problem-solving, deepen the understanding, will improve interest< Second, pay attention to the training of oral arithmetic
oral calculation is the basis of written calculation, which requires not only accuracy but also speed. The formation of oral arithmetic skills and the improvement of speed can not be achieved by one or two days of training, but by constant training. In my opinion, the effect of mental arithmetic three minutes before class is very good. Before each class, prepare ten oral arithmetic questions for students to rush to answer, or let students write in a small book, check the answers in a unified way, make a summary every other time, and praise and reward the excellent students. The enthusiasm of students has been improved, and at the same time, they will pay attention to the correct rate. Of course, remember some common values, such as 2 π、 three π、 four π……， 112, 122, 132... And so on, which have a very good effect on speeding up the speed and accuracy of oral calculation< Third, strengthen the training of estimation
many problems in daily life don't need very accurate results, so we can use estimation to solve them. In this way, the speed is accelerated, and it does not affect the actual operation. When encountering such problems, let the students estimate as much as possible. In addition, even in the calculation of accurate results, the estimation will also play a monitoring role. Every time we finish a question, we can use the method of estimation to verify its correctness< 4. Pay attention to quick calculation and skillful calculation. Quick calculation and skillful calculation, that is, we usually say simple operation, the correct use of simple methods, on the one hand, can improve the speed of problem solving, on the other hand, can also make problem solving simple, improve students' self-confidence. The teacher can teach some basic laws first, let the students answer the questions, in the example of some calculation problems, let the students find the appropriate simple method. This requires students to have a clear grasp of the basic law of operation, especially the scope of its application. For example, multiplication has distributive law, but division does not. This requires students to divide by a number into its reciprocal, in the use of distribution law for calculation< 5. Develop good habits
we know that most of the time, students do not know how to calculate, but they wrong numbers, recite wrong multiplication formulas, or make mistakes in decimal points. These are tiny mistakes, but they often occur. Therefore, the usual practice should be strict, so that students develop a good habit of calculation. The first is to train students to be serious, meticulous, neat and standard. After careful calculation, we must emphasize checking calculation. There are many checking methods, such as checking step by step; It uses addition to check subtraction, multiplication to check division; Put it into the original question to check whether it is in line with the reality; It can also be checked by the above-mentioned estimation. Regular error correction training can also rece students' careless errors to a certain extent. Display the mistakes you are prone to make one by one, and compare them with your own reality. If you have them, you can correct them. If you don't have them, you will make fewer mistakes next time
in a word, computing teaching is a long-term and complex teaching process, and improving students' computing ability is not a matter overnight. Although the above points are not comprehensive, I believe that as long as we can seriously implement the above points, it will play a certain role in improving our computing power.
4.
Many students feel headache for mathematics, because the score of mathematics is not high every time, and many knowledge points are not very clear, so how can junior high school mathematics learn to effectively improve the score
how to learn junior high school mathematics can effectively improve scores
knowledge framework diagram
I believe that as long as the above points are achieved, there will be some changes in the score of this subject. Of course, in learning, planning is essential. No matter review or study, you need to make a professional plan to help yourself learn. In addition to the above points, the score of mathematics will make considerable progress, In learning, if you encounter problems that you can't solve, you need to ask for help from teachers or better students in time, so that you can solve the difficulties and won't have an impact on future learning. The above is how to learn junior high school mathematics. I believe that if you do well in these points, the overall score of each subject will rise
5. Resolution:
under normal circumstances
1G=1000M
1GH=1000MH
1gh=1000mh
under normal circumstances
1G=1000M
1GH=1000MH
1gh=1000mh
6. Aprotic solvent is also called aprotic transfer solvent. The proton self delivery reaction of this kind of solvent is very weak or has no self delivery tendency. According to their interaction with solute, they can be divided into dipolar aprotic solvent and inert solvent. This kind of solvent can be divided into: aprotic nonpolar solvent, such as benzene, ether, carbon tetrachloride, etc; Aprotic polar solvents, such as dimethyl sulfoxide, N, N-dimethylformamide, acetone and so on, because the molecules of aprotic polar solvents have polarity, they will affect solute molecules and proce solvation effect. Protonic solvent contains - Oh, - NH, such as methanol, which will form hydrogen bond with nucleophilic reagent and make nucleophilic reagent solvable. Aprotic solvent, also known as proton inert solvent, can not give protons in the reaction system can be called aprotic solvent. Aprotic polar solvents, such as acetonitrile (CH3CN), dimethylformamide (DMF), dimethyl sulfoxide (DMSO), hexamethylphosphoryltriamide (HMPA), etc. Aprotic polar solvents can solvate cations, especially metal cations. Protonation gives a hydrogen ion, which is positively charged, making it more electrophilic. O. The coordination of H + on N and other elements can be simply understood as combining with proton, that is, combining with a proton. Generally, the substance has lone pair electrons, so it can combine with a proton through coordination bond. For example, when H2O becomes H3O + NH3 becomes NH4 +, different substances have different protonation ability, and some substances with larger dipole moment often have weak protonation ability
7.
How to learn high school mathematics well? First of all, we need to summarize the skills of answering questions
now the subject of mathematics is also a must to learn content, but now there are many children do not like this subject, because they can not do these questions, leading to the subject pull their total score, how to learn high school mathematics? What are the types of math problems
How to learn high school mathematics well also needs us to explore some learning skills and find our own suitable methods, which is still very important8. It's permanent. It's not too staged. Within 30 days from the date of going online, miners can access dpool's computing power and get 110% of the handling fee equivalent to HRT's computing power. Therefore, the earlier they join the welfare, the greater the benefits.
9. For primary school students, the cultivation of computing ability is nothing more than the cultivation of three aspects of primary school students' ability: oral arithmetic, written arithmetic and mental arithmetic. Now I will talk about my experience in teaching activities from these three aspects. 1. On the methods of strengthening oral arithmetic. Oral arithmetic, also known as mental arithmetic, is one of the abilities often used in people's daily life. It has a direct effect on the development of students' attention, memory and thinking ability. In my opinion, it is important to develop oral arithmetic in peacetime and insist on it. In the calculation class, 3-4 minutes of oral practice before each class, the form can be lively and diverse, the method should be simple and easy. In the four calculations, students should first learn the addition and subtraction of oral arithmetic, multiplication in the table and corresponding division within 20, which requires accurate and skilled oral arithmetic
2. Written calculation is based on certain calculation rules, using a pen to calculate on paper. Written calculation is helpful for students to find and check the errors in the process of calculation. In order to ensure the accuracy of calculation, it is necessary to guide students to master the checking method in teaching, and cultivate students' good habit of self-conscious checking
3. Strengthen the awareness of estimation and cultivate the ability of estimation. The new curriculum standard puts forward "pay attention to oral calculation, strengthen estimation, and advocate algorithm diversification". Indeed, estimation has important practical value. Countless examples show that the number of times a person estimates the sum proct quotient in a day's activities is far more than the number of times he makes accurate calculations. At the same time, the learning of estimation is of great significance to cultivate students' number sense
mathematics is inseparable from calculation. We should cultivate students' good habit of calculation by calculating in class and practicing every day. The cultivation of habits is also very important. The cultivation of habits is not abstract and invisible. It's real, visible and tangible. Therefore, the cultivation of habits can not be used as a slogan, we need to be down-to-earth and start bit by bit. There are many reasons for calculation errors, and bad calculation habits are the important reasons for calculation errors. Therefore, to cultivate good calculation habits is the main way and measure to improve students' calculation ability: first, to cultivate students' conscientiousness, carefulness, neat writing and standard format. Second, we must emphasize checking calculation after careful calculation. The third is to carry out error correction training regularly. Display the topics that are easy to make mistakes, and compare them with your own reality. If you have something, you can change it. If you have nothing, you can encourage it.
2. Written calculation is based on certain calculation rules, using a pen to calculate on paper. Written calculation is helpful for students to find and check the errors in the process of calculation. In order to ensure the accuracy of calculation, it is necessary to guide students to master the checking method in teaching, and cultivate students' good habit of self-conscious checking
3. Strengthen the awareness of estimation and cultivate the ability of estimation. The new curriculum standard puts forward "pay attention to oral calculation, strengthen estimation, and advocate algorithm diversification". Indeed, estimation has important practical value. Countless examples show that the number of times a person estimates the sum proct quotient in a day's activities is far more than the number of times he makes accurate calculations. At the same time, the learning of estimation is of great significance to cultivate students' number sense
mathematics is inseparable from calculation. We should cultivate students' good habit of calculation by calculating in class and practicing every day. The cultivation of habits is also very important. The cultivation of habits is not abstract and invisible. It's real, visible and tangible. Therefore, the cultivation of habits can not be used as a slogan, we need to be down-to-earth and start bit by bit. There are many reasons for calculation errors, and bad calculation habits are the important reasons for calculation errors. Therefore, to cultivate good calculation habits is the main way and measure to improve students' calculation ability: first, to cultivate students' conscientiousness, carefulness, neat writing and standard format. Second, we must emphasize checking calculation after careful calculation. The third is to carry out error correction training regularly. Display the topics that are easy to make mistakes, and compare them with your own reality. If you have something, you can change it. If you have nothing, you can encourage it.
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