1, calculated according to mathematical laws.
1=5* 1=5, 2=5*2= 10, 3=5*3= 15, 4=5*4=20
It can be concluded that 5=5*5=25.
2. brain teasers.
Suppose 1=5, then 5= 1 holds.
Extended data:
Common brain teasers
1. Winter melon, cucumber, watermelon and pumpkin can all be eaten, but what melon can't be eaten? -answer: fool.
2. There are six steamed buns in the basin, each for six children 1, and there is 1 in the basin. Why? Answer: The last child brought a basin.
Can you turn ice into water as soon as possible? Answer: the word "ice" becomes "water" if two points are removed.
In winter, the baby is afraid of the cold and refuses to take off his hat when he enters the house. But he saw a man take off his hat obediently. Who is that man? -answer: barber.
Lao Wang has to shave forty or fifty times a day and still has a beard on his face. What is the reason? Answer: Lao Wang is a barber.
6. There is a word that everyone will pronounce wrong when they see it. What's this word? -Answer: This is the word "wrong".
7. Xiaohua is at home. Who looks like him the most? -answer: yourself.
8. What's the use of egg shells? Answer: It is used to wrap egg whites and egg yolks.
9. Is there anything you don't have to work hard on? -Answer: Yawn.
10. You can do it, I can do it, and everyone can do it; One person can do it, but two people can't. What is this for? -answer: dreaming.