In hot summer, watermelon becomes a thirst-quenching fruit. Xiaoming's mother bought a big watermelon home this day. She is going to give Xiao Ming a test. she

Ask Xiaoming: "Why do you cut watermelon into 9 pieces with only 4 knives?" This question stumped Xiao Ming. He took out a piece of paper and a pencil and drew and drew, but he didn't know how to cut it. He really couldn't think of a way, so he asked his mother what the answer was. Mom smiled and said, "Tick tock!" After that, I cut the watermelon with a knife for the small demonstration.

Xiao Ming understood, took a big watermelon and ate it with relish. At this time, my mother asked again, "How about cutting 8 pieces with 4 knives?" Xiao Ming used his brain and proudly said that he used the method of rice word cutting. His mother praised him as a good student.

Use your head, nothing in the world can beat you.