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数学7上：9966×6+6678×18，怎么简便计算？乘法分配律逆运算
数学7上：9966×6+6678×18，怎么简便计算？乘法分配律逆运算
六年级数学，小升初数学，简便计算能力提升，培优专题109/115
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数学7上：9966×6+6678×18，怎么简便计算？乘法分配律逆运算
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