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77x99简便计算

=77*(99+1) =77*100 =7700

77x99 =77x(100-1) =77x100-77 =7700-77 =7623

77乘以99用简便方法怎么计算 =77×(100-1) =77×100-77 =7700-77 =7623

77x99-77 =77x(100-1)-77 =77x100-77x1-77 =7700-154 =7546 不过,题目似乎有误,应该是:77x99+77 77x99+77 =77x(99+1) =77x100 =7700

78×100-78

原式 =45x99+45+32 =45x(99+1)+32 =45x100+32 =4500+32 =4532

根据乘法分配律

原式 =(76+1)x99 =77x99 =77x(100-1) =77x100-77x1 =7700-77 =7623 供参考。

=(43+34)+77×99 =77+77×99 =77×(1+99) =77×100 =7700

55X66+66X77+77X88+88X99 =11×11×(5×6+6×7+7×8+8×9) =121×(30+42+56+72) =121×200 =24200

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