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一、故事导入教师:我先给大家讲一个数字王国里发生的故事。联合国有轮值主席制,数学王国里也有这种制度,这个月是数字3当轮值主席,它突发奇想,找
First, the story into the teacher: I first tell you a story happened in the digital kingdom. The United Nations has a rotating presidency, and there is such a system in the Kingdom of Mathematics. This month is the number 3 chair. It whims and finds