Find a 2 minute math story, a 3 minute math story before math class

Many people think that Arabic numerals were invented by Arabs, but I have always been very suspicious of him, and as I expected, today in math class the teacher introduced the true origin of Arabic numerals. It turned out to be a misunderstanding! The real inventor of Arabic numerals was the Indians, because the Arabs had a very developed maritime industry at that time, they transmitted the numbers from India to Arabia, and the Europeans learned about this simple method of counting from their books, and thought that they invented it, so they called it Arabic numerals, and later this misunderstanding spread to China.

Finally, I would love to say to the Indians:"Thank you for making it so convenient for us humans, and because of that, I love math very much. Not only is the digital domain magical, but the historical knowledge of mathematics is even richer.

Once upon a time there was a guy who loved math so much that he studied him and he was Gauss hahahahaha.

Hurry up and hurry up and sign you hk you bai

It's hard to talk about mushrooms, and it's very hard, and the woman of the 8 Railway Bureau thinks that I am forcing me to go back with me.

Lhasa 1 hee hee wear out to js nut reply Xi Po up blue record data mother-in-law skr people are my mother-in-law children Eji Guang hit chase your 1 oh demining splashed over raise praise base poison.

Earlier, there were two great mathematicians in France, one named Pascal and the other called Fermat.

Pascal knew two gamblers who posed him a question. They said that after they placed the bet, they agreed that whoever won the full five rounds first would get the entire bet. After gambling for a long time, A won 4 games, B won 3 games, it was very late, and they didn't want to gamble anymore. So, how should this money be divided?

Is it to divide the money into 7 parts, and those who win 4 rounds will get 4 shares, and those who win 3 rounds will get 3 shares? Or, because the first thing was said to be a full 5 rounds, and no one reached it, so one person divided half of it?

Neither of these divisions is correct. The correct answer is: the one who wins 4 games takes 3 4 of this money, and the one who wins 3 games takes 1 4 of this money.

Why? Let's say they both make another bet, or.

A win, or.

B wins. If.

A wins 5 rounds, and the money should all go to him;

A if you lose, ie.

A and B each win 4 games, and this money should be split in half. Now, the probability of A winning and losing is 1 2, so the money he takes should be 1 2 1 1 1 2 1 2 3 4, of course, B should get 1 4.

Through this discussion, an important concept in probability theory ——— mathematical expectation began to be formed.

In the above problem, the mathematical expectation is an average, that is, how the money that is uncertain in the future should be calculated today, which is used.

A probability of winning or losing1 2 to multiply the money he might get, and add them up.

Probability theory has since developed and has become a very widely used discipline today.

Relax yourself so that you can study better.

The first three minutes of math class are short stories with illustrated versions.

Children, do you know the story of the math genius Gauss when he was a child, and the aggressive orange friends? When Gauss was in elementary school, once after the teacher taught addition, because the teacher wanted to rest, he came up with a dusty problem for the students to calculate, the topic was: 1+2+3+

97+98+99+100 = The teacher is thinking to himself, this time the children must be counted.