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数学7上：6666×6666，怎么简便计算？原来是这样巧妙，学浪计划
数学7上：6666×6666，怎么简便计算？原来这样巧妙变形，好简单
初中数学，有理数混合运算，简便计算，基础训练，培优专题312/395
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