3.45×9.9+ 0.345简便算法
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计算3.45×9.9+ 0.345 =0.345x99+0.345x1 =0.345x(99+1) =0.345x100 =34.5
咨询记录 · 回答于2022-09-24
3.45×9.9+ 0.345简便算法
计算3.45×9.9+ 0.345 =0.345x99+0.345x1 =0.345x(99+1) =0.345x100 =34.5
答案34.5,运用乘法分配律的逆运算
乘法分配律ax(b+c)=axb+axc
逆运算。发过来用axb+axc=ax(b+c)
6.83×1.9-9×0.683简便算法
6.83×1.9-9×0.683 =6.83x1.9-0.9x6.83 =6.83x(1.9-0.9) =6.83x1 =6.83
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