10.79-4.2×0.8的简便计算?
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答案是7.43,简便运算:
10.79-4.2×0.8
=10.79-(4+0.2)×0.8
=10.79-4×0.8-0.2×0.8
=10.79-3.2-0.16
=7.59-0.16
=7.43
咨询记录 · 回答于2023-12-25
10.79-4.2×0.8的简便计算?
答案是7.43,简便运算:
10.79-4.2×0.8
=10.79-(4+0.2)×0.8
=10.79-4×0.8-0.2×0.8
=10.79-3.2-0.16
=7.59-0.16
=7.43
运用数学拆分的思想,4.2=4+0.2,然后运用乘法分配律,最后的计算结果是7.43
答案是7.43,简便运算:
10.79-4.2×0.8
=10.79-(4+0.2)×0.8
=10.79-4×0.8-0.2×0.8
=10.79-3.2-0.16
=7.59-0.16
=7.43