Ask for a few simple math stories or a few simple math stories.

The first story: Xiaoming sells garlic in the market, which costs 50 cents a catty. He shouted that someone would buy it soon. The bearer is an old lady. She said, I just want garlic, son. Xiao Ming's face turned pale. He thought, "What about my garlic sprouts?" . Suddenly an old man came over and said to Xiaoming, "Son, do you sell your garlic sprouts?" I just want garlic sprouts. Xiao Ming was overjoyed and said, "Let's sell it. Let's sell it to the old lady at 30 cents a catty and to your old man at 20 cents a catty, shall we? " The two old people cheered again and again, boasting that Xiaoming was clever. Then I paid the money, took the goods and walked away laughing. I said with a smile, "The children are really smart now, but it seems that the two of us are smarter. Ha ha ha ha ha ha ha ha ha ha. "Do you know why? Reader's second story: meteorologist Lorenz put forward an article entitled "Can butterflies flap their wings to cause tornadoes in the classified groups?" "This paper discusses that if the initial conditions of a system are a little worse, the result will be very unstable. He called this phenomenon "the butterfly effect". Just like we roll the dice twice, no matter how deliberately we roll, the physical phenomena and points thrown twice are not necessarily the same. Why did Lorenz write this paper? So how hard is it to learn from the past? If you do it, you will do it easily.