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What are the primary school math jokes?

Teacher: "I give my classmates two questions." Whoever answers the first question will not be asked to answer the first question. "

Two questions. Now I ask the first question: Who knows how many hairs they have? "

Xiaoli: "I know, I have 99,999 hairs."

Teacher: "How do you know?"

Xiaoli: "Teacher, this is the second question. You can't ask me to answer. "