The bear shop, where chickens, kittens and puppies come and go in the mountain village, is endless and very lively.
The kitten said, "I'll buy six apples, one for 0.8 yuan and one for 4.8 yuan. I'll give you 10 yuan and you call me 5.2 yuan. " The dog said, "I'll buy three watermelons, 3.2×3=9.6 yuan." The bear was so busy that he had to say, "OK, OK, OK."
I've been busy for a long time, and finally I can be quiet.
Unexpectedly, the fox came and said, "I'll buy 20 apples and 20 watermelons. For convenience, we average apples and watermelons as 2 yuan. Together, it is 40 yuan. "
The bear is in charge. It seems to be more than 40 yuan. I also calculated by computer that it should be 80 yuan, not 40 yuan!
Bear and fox have been arguing, but they still can't make up their minds. They went to see Uncle Goat.
They found Uncle Goat and told him the whole story in detail. I saw Uncle Goat say earnestly, "In fact, you have all been taken in by ordinary people." Later, Uncle Goat told Little Bear and Fox how to calculate it bit by bit.
The unit price of apples and watermelons should have been multiplied by their total amount by the law of multiplication and distribution: (0.8+3.2)×20=40 (yuan).
Bear and fox suddenly realized that mathematics is so useful in life that they should study it well in the future.
Comments: The little author wrote the role of mathematics in life in the form of fairy tales. This article is full of childlike interest.