Explanation of calculation force relationship

1. Super computing power and small currency beast exchange are cooperative relations. Super computing power's SPT has been listed in small currency beast exchange, and SPT can be freely traded by hanging orders.

5.

At the end of 2017, digital currency experienced explosive growth and Waterloo like decline in 2018, and now it tends to be stable. During this period, a large number of investors poured into the currency circle, and all kinds of digital currencies need to be bought and sold through exchanges or digital currency wallets. However, in 2018, there were frequent incidents of exchange digital currency theft, so more and more traders chose to store digital assets in digital currency wallets, Sort out the five most well-known digital currency wallets and let's get to know them

Bitpai (score: 8.5)

bitpai is a comprehensive blockchain asset service proct based on HD wallet. Its main functions include: sending and receiving, buying and selling, accelerating transaction, etc. The user controls the private key, and the coin after the transaction is completed is directly kept by the user. At present, the currencies it supports mainly include BTC, BTC, ETH, some erc2.0 tokens, qtum, HSR, dash, safe, LTC, LCH, Zec, etc and Doge

advantages: the balance of the current digital currency can be displayed at the top of the front page of the wallet, and the upper left corner can be switched to other digital currencies, and the currency balance can also be switched from quantity to legal currency value. There are many functions in the middle, such as issuing currency, receiving currency, one click trading, etc. the broadcast of each transfer transaction is displayed below, and the completed transaction can also be queried in the transaction record. After leaving the bitpai app interface for a period of time, you need to unlock it when you re-enter, which improves the security of the wallet

deficiency: Only Mainstream currencies are supported, other small currencies are not supported, and the number of currencies is 10 +. The page setting is not user-friendly, and various parameters make it difficult for users to use. In addition, the security is worrying: Recently, there is a problem with bitpai IOS version, and the application can't be opened, and the official said: if you unload it carelessly, the assets in your wallet may not be recovered! It's still in Apple communication

download address: bitpie.com

2. Geek wallet (rating: 8.2)

geek wallet is a simple and convenient light wallet, which supports the storage and management of mainstream digital currency assets such as bitcoin (BTC), lightcoin (LTC), Ethereum (ETH), EOS, usdt, etc

advantages: high security factor, using local private key security mechanism, as well as mobile phone and computer al backup strategy, supporting the current mainstream currency, the platform has a jump market, which can carry out token trading of physical assets on the chain

deficiency: usdt transaction must use 0.0001 BTC as transaction handling fee, does not support some small currencies, page optimization is good, but the function is less

download address: www.geekwallet.org 、 www.geekwallet.cn

3. Imtoken (score: 8)

imtoken is a mobile light wallet app, which supports Eth and Ethereum erc2.0 standard tokens (such as EOS, DGD, SNT, qtum), and is a necessary wallet for Ethereum series of digital currencies

advantages: as a light wallet of Ethereum series, mtoken supports all the tokens of Ethereum erc2.0 standard, can control the miner's fee of each coin, can set the amount of collection, and has convenient transaction record query, refreshing interface, simple operation, so it is suitable for ICO investors who need to receive a variety of erc2.0 standard tokens and do not trade frequently

The "discovery" mole of wallet is not intuitive enough. 2. The tokens that can only be stored on the Ethereum platform, such as BTC and Neo, can't be stored. At the same time, the bifurcations of bitcoin can't be stored

download address: token. Im

4. Kcash (score: 7.8)

kcash is also a light wallet, which currently supports BTC, ETH, LTC, etc, act and digital currency based on Ethereum and achain smart contract platform. Kcash has cross chain and cross contract technology, and the supported currencies are still increasing

advantages: as a Multi Chain Wallet, kcash supports multiple types of digital currencies and is very friendly to users who invest in multiple series of digital currencies. In addition, kcash also has the function of sending red packets, and in the future, it will launch currency transaction, bank card connection and other functions

deficiency: too many features lead to poor usability. In addition, there are some problems with the compatibility of Android versions. Some Android models will flash back when they open the app

download address: kcash.com

5. Cobo (rating: 7.8)

Cobo is a professional digital asset management wallet, which can help you store assets safely, and the unique POS gain can help you increase the value of assets. It supports more than 20 kinds of digital assets including eth, EOS, TRX, and more than 500 kinds of tokens

advantages: Cobo security is in the lead in the same level, using multiple security verification, hot and cold separation storage, HSM multi signature, Cobo provides you with stable income through intelligent voting, dpos vote pool, POS mining digital asset gain matrix

deficiency: the page optimization is poor, the function is complex, it's a little difficult to get started, and there is also a flash back problem of Android version

download address: cobo.com

6. The ratio increasing method and the equal difference increasing method are two methods to calculate the rent in the leasing business. According to its basic formula, we can dece and calculate that if the rent is calculated and paid according to the equal proportion increasing method, the actual rent rate will drop, or even drop by a large margin, resulting in the loss of the interests of the lessor; If the rent is calculated according to the equal difference increasing method, the actual rent rate is always equal to the nominal rent rate, and the calculation is simple. Therefore, the equal difference incremental method is more fair, reasonable and practical than the equal ratio incremental method

with the continuous deepening of China's middle school teaching reform, the Shanghai primary and secondary school mathematics curriculum standard (Trial draft) proposes to vigorously promote the digital mathematics activity (Dima) based on modern information technology, and establish the digital mathematics activity system based on computers and calculators (including scientific calculators Function calculator and graphic calculator) as the support, has intelligent software and rich courseware, connection information network Dima platform. Using this platform, we can improve the processing and presentation of mathematics content, and let students learn independently in the information technology environment, and carry out experiments, exploration and research

today, when we vigorously promote the universal application of information technology in the teaching process and promote the integration of information technology and subject curriculum, our school is also implementing the curriculum reform, and the graphic calculator is also applied to the classroom of mathematics expansion course. For this reason, we designed a teaching case of "using graphic calculator to study several methods of expressing arithmetic and proportional sequence"< Teaching background:

in the chapter of sequence, when explaining the concepts of arithmetic sequence and arithmetic sequence, the content is relatively simple and easy for students to master. It is the basis of learning sequence, which is helpful to cultivate students' observation ability and inction ability. The contents of the equal ratio sequence and the equal difference sequence are completely parallel, including the definition, the nature, the formula of the general term, the equal ratio (difference) median of two numbers, etc
after more than half a year of using graphic calculators, senior one students have a preliminary understanding of using graphic calculators to analyze, construct and explore mathematical problems. They felt that the use of graphic calculator not only changed their way of learning mathematics, but also increased their interest in learning mathematics. They like this "do math" way of learning very much

Graphic Calculator has many functions to use sequence, such as the use of general formula and recursive formula of sequence, sequence image and image tracking function, expression function of sequence operation table, iteration function of sequence, programming function of sequence, etc. All these have played a great role in learning the basic knowledge of sequence, correctly understanding sequence, making students experience the cognitive process of formula, understand the mathematical thinking method, and improve the ability of problem-solving in the effective attempt to guess, reasonable inction, simplified operation and verification operation< The design concept of the lesson is the core of the whole series knowledge learning. Conjecture, inction, recursion, analogy and other mathematical ideas are fully reflected in the learning of these two basic knowledge, which can be described as "although a sparrow is small, it has all five internal organs". However, it is difficult to fully and correctly show these in the traditional sequence teaching. This will lead to students' one-sided understanding of what they have learned, which will have a negative impact on the follow-up study of sequence. The graphic calculator has many functions to use the sequence, such as the use of the general formula and recursive formula, the image and image tracking function, the expression function of the operation table, the iteration function and the programming function of the sequence. All these have played a great role in learning the basic knowledge of sequence, correctly understanding sequence, making students experience the cognitive process of formula, understand the mathematical thinking method, and improve the ability of problem-solving in the effective attempt to guess, reasonable inction, simplified operation and verification operation. Therefore, we envisage that students can have a clear understanding of the two conventional series by studying and expressing the series with graphic calculator. At the same time, we also want to cultivate students' initiative and inquiry spirit and improve their mathematics learning ability through this learning process<

Design and Implementation:

the teaching content of the new textbook pays more attention to the integration of function thought and computer technology. From the beginning of this chapter, the textbook puts the number sequence in the context of function and gives the definition: the number sequence is a function with a positive integer set (or its finite subset) as the domain of definition. When the independent variable values in the order from small to large, the corresponding function value is the term of the number sequence. Sequence is a kind of discrete function. In the allocation of exercises, teaching materials are often compared with function teaching. The general term formula, recurrence formula and image of arithmetic sequence and proportional sequence are the main contents of our research in this lesson. We imagine that with the help of graphic calculator, we can make students have a vivid, comprehensive and correct understanding of sequence knowledge by doing mathematics, so as to improve students' mathematical thinking ability and cultivate students' correct mathematical view, Really improve students' interest in mathematics learning

case 1 (1) find the 11th term of the arithmetic sequence - 121, - 110, - 99, - 88,...

2) write the general term formula and recurrence formula of the sequence

for this problem, in fact, according to its basic law, you can calculate the result. But using graphic calculator can make us think about the solution of the problem from many angles, which is concive to students' comprehensive and correct understanding of the characteristics of arithmetic sequence, so as to simplify the calculation

method 1: use the numerical iteration function (as shown in Figure 1):

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method 2: use the array function of the graphic calculator (as shown in Figure 2):

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method 3: use the recursive function of the calculator

Figure 3: Use & iquest on the premise of setting the function function function; Key, which is the same as Figure 1< Method 4: guess the recurrence formula and the general term formula of the sequence, check whether the recurrence formula and the general term formula of the sequence are correct through the sequence related function of the calculator, and calculate the 11th term of the sequence:

Figure 4 guesses the recurrence formula of the sequence according to the characteristics of the sequence, Using the function of figure calculator, using Y & # 39; Draw a table

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Fig. Then, we also use y & # 39; Draw a table< Note: while solving this problem, we can also verify that "the general term formula of arithmetic sequence is a special first-order function" through graphic calculator

as shown in Figure 7, we can get that the image of sequence is a discrete point on a straight line, from which we can see that sequence is a special function< Method 5: because the number sequence is a special function, we use the function of graphic calculator to think about the problem.

figure 8 is under the cognitive condition of "the number sequence is a special function", we use the function of calculator to get the function y = - 121 + 11 (x-1), and use the connection between the function and the number sequence an = - 121 + (n-1) to think about the related problems of the number sequence< Method 6: make full use of the function fitting function of the graphic calculator to get the general term formula of the sequence through the combination of number and shape

Figure 9: use the linear regression function of the graphic calculator to list the table of the sequence first, and then connect the general term formula of the arithmetic sequence with the first-order function according to the data in the table, By using the fitting function of graphic calculator, the function relation is obtained, and the general term formula of sequence is obtained< Method 7: use the programming function of graphic calculator to solve the problem of sequence (as shown in Figure 10)

10

comments: Method 1 and method 2 use the iterative function of calculator, but method 2 shows the corresponding relationship between the serial number and the value of the item in the sequence, from which we initially realize that the sequence is a special function

the fourth method is to guess the recurrence formula and general term formula of the sequence, under the support of the sequence function of the calculator, from the operation table of the sequence or the tracking of the image of the sequence to verify whether your guess is correct, and get the answer to the problem to be solved. This kind of learning method is helpful to cultivate students' ability of analysis, conjecture, demonstration and inction. This is what we lack in our regular learning, and the use of graphic calculator has built us such a learning method platform

method 6 and method 7 are both under the condition that the number sequence is a special function. Supported by the function function of the calculator, we find a way to solve the problem by guessing or fitting the analytic formula of the function, which is helpful for students to learn the knowledge of the number sequence and understand the characteristics of the number sequence, Method 8 adopts the programming function of graphic calculator, which can't be achieved in general mathematics teaching. It reveals the essence of arithmetic sequence from another perspective< (3) is 209 the item in the sequence, and if so, what is it< Method 1, array method 2, table method 3, image method 4, equation solving method the purpose of setting this question is: on the basis of the first question, using the functions of operation, tracking and equation solving of graphic calculator to cultivate students' reverse thinking and improve their mathematical thinking ability

it should be pointed out that the sequence we discussed above is tolerance D & gt; 0, for beginners, they often have certain thinking set, such as: "tolerance D & gt; In order to avoid similar problems, we especially remind students to pay attention to the differences between the following two types of sequence

(1) constant sequence (2) arithmetic sequence with negative tolerance

- 2, - 2,... 3, 1, - 1, - 3, ...

students should have a correct understanding of the dialectical relationship between general and special<

case 2: make up a topic of equal ratio series, and study the related properties of equal ratio series

find out typical problems from students' many problems, and study them together with teachers and students, including the examples in the book

(in real life, such as loan to buy a house, population growth and the change of housing area - pay attention to the hot issues around the people, Pay attention to guide students to apply their knowledge to related subjects, life and proction practice, so that students can develop their thinking ability while acquiring and applying knowledge, so that students can use existing knowledge to communicate, and abstract practical problems into mathematical problems and establish mathematical models.)

such as "a foot of the hammer, half of the day, never exhausted", and asked to say its mathematical model, find out its general formula

(both new and old textbooks and textbooks are being compiled, etc.)

7. Maybe there is a direct connection between them, which is the form of one link to one link.

8. Construct vector triangle, then use trigonometric function

9. IPFs computing power ark and fompound are partners. Aihui, the founder of fompound, is the co-founder of computing power ark.

10. The ratio of the magnetic inction intensity B of a point in the magnetic field to the permeability of the medium is called the magnetic field intensity of the point, which is expressed by H. that is, H = B / μ. The magnetic field intensity is also a vector. In a uniform medium, its direction is the same as that of the magnetic inction intensity. In the international system of units, its unit is ampere / meter (A / M). The formula of the force of the magnetic field on the current is obtained from the magnetic inction intensity B = f / IL and the deformation f = bil