ICO blockchain tutor

1. bitcoin is a kind of virtual digital currency proposed by Nakamoto in 2009. It is characterized by no centralized issuing institution and a fixed total of 21 million pieces. It is not a one-time issue and needs to be proced by miners. Due to the decentralized structure, trust needs to rely on cryptography and consensus mechanism technology to achieve
blockchain is a general technology derived from bitcoin. It implements a decentralized database model. Bitcoin can be called blockchain 1.0 because it has no concept of smart contract. The key technologies of blockchain include cryptography encryption and decryption and consensus mechanism. Blockchain is generally used to combine with specific business logic, which needs to rely on smart contract, which provides an execution mode free from human interference
the IPO of ICO originates from the concept of initial public offering (IPO) in the stock market. It is the behavior of blockchain project to issue token for the first time, raise bitcoin and solve Ethereum and other common digital currencies.

2. Bitcoin virtual currency was invented by Nakamoto (alias) in 2009
the underlying technology of blockchain bitcoin is actually that it supports the stability of bitcoin in the past eight years. You can understand it as a subversive accounting method or database, and the core is decentralization
ICO, which is essentially blockchain crowdfunding. If an enterprise does ICO, you can understand it as IPO, But the financing is not money, but virtual currency, such as 3000 bitcoins. Of course, you can choose to sell it in any country in exchange for the legal tender of a country

3. First of all, if conditions permit, try to choose to study in the first tier cities, which are technology gathering areas after all. Secondly, we will examine other aspects, such as teachers, curriculum system, teaching mode, employment salary, tuition hours, etc. Go directly to the audition to investigate the real situation of the school
Yin Cheng, a graate of Tsinghua University, is a top professional in the field of blockchain in China. He is proficient in C / C + +,, golang, python, kalilinux, sicikit learn and tensorflow. He is an EOS open source contributor and has developed many blockchain cryptocurrencies. He once served as Google algorithm engineer and a gold medal lecturer in Microsoft tech.ed conference. He is the most valuable expert in the field of artificial intelligence and blockchain in the world. He also has 15 years of programming experience and 5 years of teaching experience. He is a senior software architect and Intel Software Technology expert. The teaching and research team of blockchain college led by him is mainly composed of master's and doctoral students who graated from Tsinghua University, Peking University and other well-known institutions
the team has rich practical experience in blockchain and has won many blockchain competitions.

4. 1、 Basic training

from the psychological characteristics of different ages of primary school students, the basic requirements of oral arithmetic are different. Low and middle grade students mainly add one or two digits. It is better for senior students to take the one digit by two digit mental arithmetic as the basic training. The specific requirement of oral arithmetic is to multiply the number of one digit and the number of ten digits of two digits, and then add the proct of multiplying the number of one digit and the number of one digit of two digits to the three digits, and quickly say the result. In primary school, this training is a sublimation training of abstract thinking of numbers. It is very beneficial to promote the development of thinking and intelligence. This exercise can be arranged in two periods. One is to read in the morning, the other is to arrange a group at the end of homework. Each group is divided as follows: one digit is optional, corresponding to the number of one digit or ten digit in two digits. There are 18 questions in each group. Let the students write the formula first, then write the number directly after several times of oral calculation. In this way, after a period of time (generally 2-3 months), the speed and accuracy of oral calculation will be greatly improved< Second, the main form of the number of senior primary school students has changed from integer to score. In the operation of numbers, the addition of different denominators is the most time-consuming and error prone place for students, and it is also the key and difficult point of teaching and learning. How to overcome this key and difficult point? It is proved that it is correct to put the oral calculation of fraction operation on the addition of fractions with different denominators. Through analysis and inction, there are only three cases of different denominator addition (subtraction) method, and each case has its oral arithmetic law. As long as students master it, the problem will be solved

1. For two fractions, the large number in the denominator is the multiple of the decimal

for example, "1 / 12 + 1 / 3", in this case, oral arithmetic is relatively easy. The method is: the big denominator is the common denominator of two denominators. As long as the small denominator is expanded by multiple, until it is the same as the big number, the denominator is expanded by several times, and the numerator is also expanded by the same multiple, We can add the fractions with the same denominator for oral calculation: 1 / 12 + 1 / 3 = 1 / 12 + 4 / 12 = 5 / 12

2. The denominator of two fractions is coprime. This kind of situation is more difficult in form, and students are also the most headache, but it can be changed from difficult to easy: after it is divided, the common denominator is the proct of two denominators, and the numerator is the sum of the proct of the numerator of each fraction and the other denominator (if it is subtraction, it is the difference of the two procts), such as 2 / 7 + 3 / 13. The oral calculation process is: the common denominator is 7 × 13 = 91, molecule 26 (2 × 13)＋21(7 × 3) = 47, the result is 47 / 91

if the molecules of both fractions are 1, the oral calculation is faster. For example, "1 / 7 + 1 / 9", the denominator is the proct of two denominators (63), and the numerator is the sum of two denominators (16)

3. Two fractions and two denominators are neither coprime numbers nor multiples of decimals. In this case, we usually use the short division method to get the common denominator. In fact, we can also calculate the general score directly in the formula and get the result quickly. The common denominator can be obtained by enlarging the large number in the denominator. The specific method is: to double the large denominator (large number) until it is a multiple of another denominator decimal. For example, 1 / 8 + 3 / 10 expands the large number 10, 2 times, 3 times and 4 times, and compares it with the decimal 8 every time to see if it is a multiple of 8. When it is expanded to 4 times, it is a multiple of 8 (5 times), then the common denominator is 40, and the numerator is expanded by the corresponding multiple and then added (5 + 12 = 17), and the number is 17 / 40

the above three cases are also applicable to the addition and subtraction method with score< Thirdly, the content of memory training is extensive, comprehensive and comprehensive. Some common operations are often encountered in real life. Some of these operations have no specific rules of oral arithmetic and must be solved by strengthening memory training. The main contents are as follows:

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2. The proct of the approximate value of PI 3.14 with one digit and with several common numbers 12, 15, 16 and 25

3. The denominator is the decimal value of the simplest fraction of 2, 4, 5, 8, 10, 16, 20 and 25, that is, the interaction between these fractions and decimals

the results of the above numbers, whether in daily work or in real life, are used very frequently. After mastering and remembering them, they can be transformed into abilities and proce high efficiency in calculation< Four, regular training

1. There are mainly five laws in this aspect: commutative law and associative law of addition; Commutative law, associative law and distributive law of multiplication. Among them, the multiplication distribution law is widely used and has many forms, including positive use and negative use, and the forms of integer, decimal and fraction. In the multiplication of fractions and integers, students often ignore the application of the law of distribution of multiplication, which makes the calculation complicated. Such as 2000 / 16 × 8, using the law of multiplicative distribution, the result is 1001.5, but using the general method of false fraction is time-consuming and easy to make mistakes. In addition, there are subtraction properties and quotient invariant properties< 2. Regular training. It is mainly the oral calculation method (strategy) of the square result of the two digit number of 5

3. Master some special cases. For example, in fractional subtraction, if the numerator is not enough to be subtracted after general division, and the numerator subtracted is usually larger than the numerator subtracted by 1, 2, 3 and other smaller numbers, no matter how big the denominator is, it can be directly calculated orally. For example, the difference between 12 / 7 and 6 / 7 is only 1. The difference between 12 / 7 and 6 / 7 must be 1 less than the denominator. The result is 6 / 7 without calculation. Another example is: 194 / 99-97 / 99, if the difference between the numerator and denominator is 2, the difference between the numerator and denominator is 2, and the result is 97 / 99. When the subtracted molecule is larger than the subtracted molecule by 3, 4, 5 and other smaller numbers, the result can be quickly calculated orally. Another example is the mental calculation of the proct of any two digit number and 1.5, which is two digits plus half of it< 5. Comprehensive training

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2< 3. Comprehensive training of four mixed operation sequences

comprehensive training is concive to the improvement of judgment ability, reaction speed and the consolidation of oral arithmetic

of course, in order to make students master the above situations, teachers should first use them skillfully, so that they can be handy in guiding and improve the effect. At the same time, the training should be carried out persistently. It is difficult to achieve the expected effect to catch fish in three days and dry the net in two days.

5. 1、 To cultivate children's interest in calculation
"interest is the best teacher". In the teaching of calculation, first of all, we should stimulate children's interest in calculation, make students happy to learn and do, teach students to master certain calculation methods, and achieve the goal of correct calculation and fast calculation
in order to improve students' interest in computing, we should combine teaching with fun and pay attention to the diversification of training forms. For example, the design of mathematical exercises for a small train: (for example: 9 + 6 = 15 15 + 60 = 75 75-50 = 20 20 + 32 = 52 52-9 = 43 + 8 = 51) in the classroom, I use the way of men and women's competition training; Let the students do oral arithmetic or listen to it in the form of cards in class. Let children use a variety of forms of training, not only can improve the interest of calculation, but also cultivate children's good habit of calculation< Second, in close contact with daily life, making use of various activities in daily life is a very important way to carry out mathematics ecation for children. The surrounding environment of children's life is full of knowledge and content about number, quantity and form. Using daily life to carry out mathematics ecation can make children acquire simple mathematics knowledge in a relaxed and natural situation, and arouse their interest in mathematics. When going up and down stairs, children can count the number of stairs while walking. Similarly, when organizing children's walking, labor and other activities, they can randomly and flexibly guide children to understand and review the knowledge about numbers and shapes, so that children know that the world around them is full of all kinds of mathematical knowledge, thus arousing their interest in exploring and learning mathematics< Third, pay attention to the intuitive demonstration teaching method
the demonstration method is one of the intuitive teaching methods. In the calculation teaching, the teacher demonstrates the real object or teaching aids, carries on the demonstrative operation, presents the number or shape knowledge in the intuitive form, enables the children to obtain the abstract mathematics knowledge through the intuitive means, and cultivates the children's observation ability and imagination ability. The demonstration method is suitable for children of all ages. Its advantage is that it can make children get rich typical perceptual materials, so as to deepen the understanding of the preliminary knowledge of mathematics. Of course, the role of language is indispensable in the process of demonstration. Teachers should use vivid, vivid and clear language to explain, or put forward some enlightening questions, so that children can think and their thinking activities are always in a positive state. For example, when teaching children to understand the meaning of "bisection", the teacher can take a square piece of paper for demonstration, first fold it in half and divide it into two rectangles of the same size. The teacher divides equally and guides the children to observe how the teacher divides a square into two rectangles. At the same time, let the children observe and compare whether the two rectangles are exactly the same. Then the teacher can also use the same method to show the children the process of dividing a rectangle and a circle equally. Finally, on the basis of direct perception, children can divide a figure into two identical figures through thinking, that is, bisection. When using the demonstration method, we should pay attention to:
first of all, the demonstration should highlight the key points and difficulties of knowledge, let children observe, compare and think clearly. In the process of demonstration, we should guide children to observe the main aspects of the object, not too plot, so as not to distract children's attention. Secondly, the teaching aids used in the demonstration should be larger, so that each child can see each action clearly, so as to help focus the attention of children and give full play to the role of demonstration. Third, the demonstration should be accompanied by simple, clear and vivid instructions, and the content of the demonstration should be expressed in language, so that children can get a deep impression< In the process of teaching, teachers do not directly tell children the preliminary knowledge of mathematics, but guide them to discover and explore the preliminary knowledge of mathematics on the basis of their existing knowledge and experience. This method can fully mobilize the enthusiasm and initiative of children's learning, and improve children's exploring spirit of learning mathematics and the ability to solve problems independently. The general steps of using guided discovery teaching method are: teachers guide children to observe and operate directly, at the same time, they ask children questions, let children think, find out the way to solve the problem, and get the answer (conclusion) of the problem
for example, when children in large classes learn subtraction, through observation and operation, they know that one of the original objects has been removed, and none has been removed, or is equal to zero. Let's say 1-1 = 0. Using the same method, we can know that 2-2 = 0, 3-3 = 0, etc. On this basis, we should guide children to find the rule that the subtraction of two identical numbers is equal to zero. We can also use the guiding discovery method to make children know the simple law of the composition of numbers< 5. Correct the mistakes and practice more than once.
If a child makes mistakes in calculation, it shows that he does not have a solid grasp of this kind of calculation, and it is useless to correct the mistakes. We know that if we want to cut a piece of wood with a knife, the second knife will certainly follow the notch of the first knife. If the first knife is cut wrong, the second and third knives must be very careful to cut well. If you don't pay attention, you will slip to the notch of the first knife again. Therefore, when children make mistakes, they must make one mistake and practice ten to get the effect. I often give children examples of knitting sweaters. When we first learned how to knit sweaters, although we had mastered the method and were very attentive, we often made mistakes and needed to take them apart and start over. When we are proficient, we can chat, watch TV and knit sweaters at the same time. The same is true of learning. Improving children's calculation speed and accuracy is the real way to lighten their burden
computing ability is one of the most basic learning abilities, but the isolated numbers are always boring. We think that with the growth of children's age, it is necessary to increase the difficulty of some games. New challenging games can stimulate children's interest in exploration, and repetitive training should be enough. Otherwise, it will not promote children's learning ability, but may lead to children's boredom and hinder further learning.

6. 1. A thief is a villain, wiser than a gentleman; The devil is one foot high and the road is one foot high; The way is high, the devil is high
2. Learning is good at the beginning, but it can always be used by people with bad intentions in the end; At the beginning, blockchain wanted to create an ideal social state of "currency" academic. In fact, this is impossible. Currency is the general equivalent under the governance of group interests. The speculators saw its rarity, so they lost their original shape.

7. Print to the nearest Social Security Bureau
there are three types:
1. If an employee inquires and prints his / her detailed insurance information, he / she needs to provide the original ID card and the original social security card (check the original and take back the photo); If an employee entrusts others to inquire about his / her insurance information, he / she shall provide the original of the power of attorney, the original of the client's ID card, the original of the client's social security card and the original of the trustee's ID card (except for the original of the power of attorney, the original of other materials shall be checked and photocopies shall be collected)
2. If the company inquires and prints the personal insurance information of its employees, it is necessary to provide the inquiry proof materials with the official seal of the company and the original ID card of the operator (the original proof materials, the original ID card and the photo shall be received)
3. Querying and printing the detailed list of indivial insurance is a free business
therefore, enterprises sometimes mention that printing enterprise payment details is actually printing payment notice; In the system, the enterprise can not see the details of the payment to a specific employee. If you want to know, you can enter the ID number of the employee in the social security center to inquire, or the employee will log in to the Tianjin city's human resources or social security net to inquire. Basic medical insurance is a social insurance system established to compensate workers for the economic losses caused by disease risks. Through the payment of employers and indivials, the medical insurance fund is established. After the medical expenses of the insured are incurred, the medical insurance agency will give certain economic compensation, so as to avoid or rece the economic risks caused by the illness and treatment of workers
basic medical insurance is one of the most important types of insurance in the social insurance system, which, together with basic endowment insurance, work-related injury insurance, unemployment insurance and maternity insurance, constitutes a modern social insurance system
on May 1, 2016, provinces (autonomous regions and municipalities) that have paid more than 20% of the basic endowment insurance for enterprise employees will rece the payment ratio to 20%
provinces (autonomous regions and municipalities) with 20% of the unit contribution and more than 9 months of the accumulated balance of the basic endowment insurance fund for enterprise employees at the end of 2015 can rece the unit contribution to 19% in stages, and the period for recing the rate is temporarily two years. The specific plan is determined by each province (region, city)
reference: Internet - Basic Medical Insurance

8. If you have spare money, you can go to the okex platform to open an account, smash it in and do a long-term job. You don't have to care about the rise and fall in the middle. This requires you to have a good attitude or make a fixed investment every month.

9. I don't know what the hell it is