1.28×8.7+7.2×87
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1.28x87+7.2x8.7 =1.28x87+0.72x87 =87x(1.28+0.72) =87x2 =174
咨询记录 · 回答于2022-11-17
1.28×8.7+7.2×87
同学,麻烦把原题的截图发出来看一下
答案637.536简便计算 1.28x8.7+7.2x87 =0.128x87+87x7.2 =87x(0.128+7.2) =87x7.328 =637.536
答案637.536简便计算 1.28x8.7+7.2x87 =0.128x87+87x7.2 =87x(0.128+7.2) =87x7.328 =637.536
答案637.536简便计算 1.28x8.7+7.2x87 =0.128x87+87x7.2 =87x(0.128+7.2) =87x7.328 =637.536
这个题应该这样出1.28x87+7.2x8.7
1.28x87+7.2x8.7 =1.28x87+0.72x87 =87x(1.28+0.72) =87x2 =174
简便运算,乘法分配律的逆运算
4.4x2.5=1.1x4x2.5=1.1x(4x2.5)=1.1x10=11
4.78➗0.25➗4 =4.78➗(0.25x4) =4.78➗1 =4.78都是简便计算