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张三与王五是一对数学迷,他们常常互相出题考对方。一天,他们刚刚见面,师傅老李给他们出了这样一道题来考他们:
Zhang San and Wang Wu are a pair of math fans, they often test each other to test each other. One day, they just met, the teacher Lao Li gave them a question to test them: