First of all, the math teacher, a young man in his 20s, the deepest impression of the little brother to me is not the profound variety of middle school math formulas, but his speedy speech, have you seen "The Voice of China"? Do you know Hua Shao? Okay, please imagine for yourself...... After listening to him give a lecture, the crowd agreed that there would be one more genius in the world of mathematics.

Then there is the teacher who teaches logic, his teaching can be said to be amazing, if you listen to his class, you will feel that you have been half-brained for so many years. The following is the classic handout of this brother: A person is going to have a wedding, he invites his father's family, and also invites his sister's family, assuming that each family is a husband and wife, ask him what the minimum number of people to invite is. Let me tell you, the answer is 2. Please guess for yourself 1 hour later, If you still can't guess it, please look at the answer after the dividing line――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――― Answer analysis: If the sister marries her father, then the two families are 1 family, so at least 2 people (the teacher also emphasized that this is a test of logic, don't think about reasonableness or ethics or anything). After listening to this analysis, the crowd unanimously changed from an exclamation mark to a question mark and an exclamation mark. This result directly led us to treat the first logic lesson as the last one, skip the class, I admit that the logic failed......