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191问答库 > 1.25*(4.2*8)的简便算法？

1.25(4.28)的简便算法？

2025-03-15 17:06:36

推荐回答（3个）

回答1：

就是直接计算即可，利用乘法的交换律得到1.25*8*4.2就是42

回答2：

这道题用乘法交换律做简单。
1.25×(4.2×8)
=1.25×8×4.2
=10×4.2
=42

回答3：

1.25×（4.2×8）
＝1.25×8×4.2
＝10×4.2
＝42

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