Combined with the things encountered in real life, students or their names are often used to ask questions, which leads to classroom interaction and students are often more interested in answering. In addition, the humorous stories of mathematicians can be appropriately added to improve the classroom level.

The following humorous topics:

Chickens and Rabbits * *15, * * * has 40 feet. How many chickens and rabbits are there?

Normal answer:

"Let the number of chickens be X and the number of rabbits be Y." ...

Classic solution

Suppose chickens and rabbits are well trained, whistle and lift one foot, 40- 15=25. Blow the whistle again and lift one foot, 25- 15= 10. At this time, the chicken is sitting on the ground, and the rabbit is still standing on two feet. So there are 10÷2=5 rabbits, 15-5= 10 chickens.