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数学7上：简便计算9996×6+6678×18，怎么找公因数？乘法分配律
数学7上：简便计算9996×6+6678×18，怎么找公因数？乘法分配律
六年级数学，小升初数学，简便计算能力提升，培优专题17/115
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