Force equivalence

1. Not really. Cost alone is not enough. There must be demand
there is still demand, so the price hasn't collapsed yet. Relying on this price, is not behind the so-called cost, but big players are not willing to bear the premium selling. Bitcoin will fall at least to around 5000 this round. It is possible to stabilize (only possible). Even if it is stabilized, it may take a long time.

2. There are two reasons why calculation always makes mistakes. One is technical, that is, the principle is not clear and the concept is confused, so it is easy to make mistakes. On the other hand, it is perceptual, e to carelessness. There are two ways to improve the computing ability: one is to strengthen the concept and principle of computing, the other is to focus on the training of the degree of care. Most of the children's calculation errors are caused by carelessness, which can be targeted for intensive training, but this is only a temporary training method. In the long run, it is necessary to cultivate children's carefulness in their daily study and life, do things in a planned way, and only good habits are the root causes
1. Strengthen the teaching of basic knowledge and skills to improve the rationality of operation. In teaching, basic knowledge is the basis of calculation theory, which has guiding significance for calculation. The confusion and fuzziness of basic knowledge and the fact that basic knowledge is too hard are often the root causes of calculation errors. Therefore, strengthening and implementing double base teaching is a very practical problem to improve calculation ability
2. Pay attention to the cultivation of students' practical ability and improve the simplicity of operation. In the normal teaching process, teachers must spare no time for students to practice more. On the basis of understanding theorems, formulas, algorithms, etc., they should also practice more to consolidate their memory and deepen their impression. If necessary, the effect will be better if some knowledge points are subject intensive training. Through the questionnaire survey, 80% of the students think that this kind of special topic examination training effect is very good
3. Pay attention to variant training and improve the proficiency of calculation. When commenting on an examination question, teachers should not only be satisfied with explaining the question thoroughly, but also be good at extending the variant of the question and drawing inferences from one instance. Only in this way can students "see both trees and forests" and get twice the result with half the effort. This requires teachers to be good at knowledge accumulation and summary
4. Pay attention to the standardization of problem solving process and improve the accuracy of calculation. Some teachers pay more attention to the analysis of the law of problem solving, thinking and the internal relationship of knowledge when commenting on test questions, but they do not pay enough attention to the process of problem solving, such as the standardization of writing, the skills and accuracy of calculation, etc., resulting in the situation that students can not get full marks or can not get full marks. This requires teachers to standardize writing and attach importance to their exemplary role
in the process of improving students' mathematical operation ability, we must be patient. In the process of training, in addition to explaining the basic concepts, theorems and rules, we should also cultivate students' memory ability, observation ability, understanding ability, associative ability, expression ability, logical thinking ability and other mathematical abilities in a purposeful, step-by-step and hierarchical way, and conct appropriate exercises, Only in this way can we improve the students' mathematical operation ability, so as to improve their ability of learning mathematics.

3. In brief, I hope to help you with the four elements of operation ability: accuracy, reasonableness, brevity, speed. The cultivation ways of operation ability are as follows: 1. Accurately understand and firmly grasp the concepts, properties, formulas, rules and some commonly used data required by various operations; 2; The deep understanding of concepts, properties, formulas and rules directly affects the choice of methods and the speed of operation. The concept is fuzzy, the formula and the rule are ambiguous, which will certainly affect the accuracy of the operation. In order to improve the speed of operation, it is necessary to memorize some commonly used data. For example, the square of natural number within 20, simple Pythagorean number, special trigonometric function value,,,,, LG2, Lg3, e accurate to approximate value of 0.001, etc. 2、 Master the general methods and rules of operation, and flexibly use concepts, properties, formulas and rules for operation. Teachers can combine the content of teaching materials, compile and collect some flexible exercises, cultivate the flexibility of students' calculation, and guide students to collect, summarize and accumulate experience to form skilled skills, so as to improve the simplicity and rapidity of calculation. 3、 Pay attention to the typical demonstration of teachers and examples in learning, and make clear the goal of solving problems, the steps of calculation and their basis. Through the typical demonstration, the transition from understanding knowledge to application knowledge is relatively smooth, thus forming the computing ability. 4、 To improve the reasoning ability in operation, the essence of mathematical operation is to dece the result from the known data and formula according to the definition and nature of operation, which is also a process of reasoning. Whether the operation is correct or not depends on whether the reasoning is correct. If the reasoning is not correct, the operation will be wrong. We should pay special attention to the equivalent transformation in operational reasoning. 5、 Pay attention to the training of the ability of identity transformation of numbers and expressions. 1. Symbol transformation, for example, symbol transformation when removing brackets and adding brackets. 2. Reciprocal transformation, such as addition and subtraction, multiplication and division, power and root, differentiation and integration, etc. 3. Formula change. For example, A2 + B2 = (a + b) 2-2ab, etc. 4. Decomposition transformation, for example, given X-Y = 3, Y-Z = 5, finding x-z, we can decompose x-z = (X-Y) + (Y-Z). 5. Substitution transformation, such as introcing auxiliary elements, constructing auxiliary functions, adding auxiliary lines, adding parameters, etc. 6、 To strengthen the operation practice, any ability is formed and developed in certain practical activities. In order to effectively improve the students' operation ability, we must strengthen the practice, and the practice should be purposeful, systematic and typical. Through changing, changing, solving and using one question, we can cultivate the proficiency, accuracy, flexibility and organization of calculation. In the form of question group training, students' thinking profundity in the process of operation is cultivated, and their operation ability is improved. 7、 Develop the habit of checking calculation, master the checking method, and check the process and result of calculation in the process or at the end of the calculation, so as to correct the errors in the process or result of calculation in time, and master the checking method. For example, to solve an equation, the solution can be substituted into the original equation test. For solving fractional equation, irrational equation, logarithmic equation and exponential equation, the value range of unknowns can also be tested. The test methods usually include: rection method, substitution method, valuation method, inverse operation, etc

4. Chinese famous mathematicians Hua Luogeng and Guan Zhaoyi put forward in 1958 that operation ability, logical thinking ability and spatial imagination ability are the three basic abilities of mathematics. The operation ability is mainly reflected in the correct, reasonable, flexible and skilled degree of the four operations of integer, decimal, fraction and percentage, and in the skilled and rich identical deformation of the sum of numbers (including complex fraction, algebraic formula, ratio, proportion formula, equation, the most basic form), It is shown in the proficiency, richness and profundity of the equivalent transformation of basic quantitative relations. Among them, the four mixed operations of integers are the most basic. Mastering and flexibly using the four operation methods of integers and simple calculation methods will be of great help to the improvement of students' operation ability.

5. The training ways of operation ability are as follows:

1. Accurately understand and firmly grasp the concepts, properties, formulas, rules and some commonly used data required by various operations; The deep understanding of concepts, properties, formulas and rules directly affects the choice of methods and the speed of operation. The concept is fuzzy, the formula and the rule are ambiguous, which will certainly affect the accuracy of the operation. In order to improve the speed of operation, it is necessary to memorize some commonly used data. For example, the square of natural number within 20, simple Pythagorean number, special trigonometric function value,,,,, LG2, Lg3, e accurate to approximate value of 0.001, etc< Second, master the general methods and rules of operation, and flexibly use concepts, properties, formulas and rules for operation. Teachers can combine the content of teaching materials, compile and collect some flexible exercises, cultivate the flexibility of students' calculation, and guide students to collect, summarize and accumulate experience to form skilled skills, so as to improve the simplicity and rapidity of calculation< Third, pay attention to the typical demonstration of teachers and examples, and make clear the goal of solving problems, the steps of calculation and the basis. Through the typical demonstration, the transition from understanding knowledge to application knowledge is relatively smooth, thus forming the computing ability< The essence of mathematical operation is to dece the result from the known data and formula according to the definition and properties of operation, which is also a process of reasoning. Whether the operation is correct or not depends on whether the reasoning is correct. If the reasoning is not correct, the operation will be wrong. We should pay special attention to the equivalent transformation in operational reasoning< 5. Pay attention to the training of the ability of identity transformation of number and form

1. Sign transformation, for example, sign transformation when removing brackets and adding brackets

2. Reciprocal transformation, such as addition and subtraction, multiplication and division, power and root, differential and integral, etc

3. For example, A2 + B2 = (a + b) 2-2ab, etc< For example, given X-Y = 3, Y-Z = 5, finding x-z can decompose x-z = (X-Y) + (Y-Z)< For example, introcing auxiliary elements, constructing auxiliary functions, adding auxiliary lines, adding parameters and so on< Sixth, strengthen the operation practice. Any ability is formed and developed in certain practical activities. In order to effectively improve the students' operation ability, we must strengthen the practice. The practice should be purposeful, systematic and typical. Through changing, changing, solving and using one question, we can cultivate the proficiency, accuracy, flexibility and organization of calculation. In the form of question group training

6. In high school mathematics learning, with the deepening of learning content, the level of operation is also constantly improving, and high school students are exposed to more and more problems in operation. Students do not pay enough attention to the improvement of operation ability, which not only affects the development of students' thinking ability, but also inevitably affects the improvement of teaching quality.

7. I don't think so. Relativity is a mode of thinking, a basic theory of space-time and gravity
the basic assumption of relativity is the principle of relativity, which breaks the theoretical model created by Newton's classical physics and changes people's view that time and space are universal measures for a long time
mechanics mainly studies force and energy and their relationship with the equilibrium, deformation or motion of solids, liquids and gases< Therefore, relativity does not belong to mechanics.

8. In high school mathematics learning, with the deepening of learning content, the level of operation is also constantly improving, and high school students are exposed to more and more problems in operation. Students do not pay enough attention to the improvement of operation ability, which not only affects the development of students' thinking ability, but also inevitably affects the improvement of teaching quality.