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Adding a straight line will turn the bottom into two triangles.
As shown! This picture is a face with five vertices on the same plane! Adding a straight line can divide the picture into two parts! Form two triangles! There are six vertices! In order to form fewer vertices! The added line must start from the vertex of the original figure! There are 25 cases of this * * * as shown in the figure!

Form at least 7 vertices! So there is no solution to this problem!

Let me analyze which boring and painful joke it is!

(Many people have commented recently! Here is the general reply! This is the first question I know to answer! I didn't expect such a strong reaction!

I have participated in the Olympic Games since I was 3 years old! The topic of Olympic Mathematics is to be more practical! But there can't be a topic like group owner! I saw this question from other people's space, and I didn't answer it myself. Baidu came up to find the answer! But I didn't answer the answer I saw, because I didn't think it was the right answer! When I was at school, I often made mistakes in math and physics problems, and there were no correct answers! I was so bold to argue that there was no solution to this problem! The teacher will also give points!

And I add a face (thick solid line). I think it's a brain teaser. If it is an Olympic math problem, I think it is wrong! Many physical and chemical problems are carried out under ideal conditions! If you don't understand, I'll spend some time making up lessons for you. If children want to play freely in such topics in the future, the answers are varied!

Finally, say hello to the swearing mothers!