2.02×8.5简便计算 56×1.25 0.8× - 知识问答

2.02×8.5简便计算 56×1.25 0.8×0.25×0.4×12.5

1个回答

2.02×8.5
=（2+0.02）×8.5
=2×8.5+0.02×8.5
=18+0.17
=17.17
56×1.25
=7×（8×1.25）
=7×10
=70
0.8×0.25×0.4×12.5
=（0.8×12.5）×（0.25×0.4）
=10×0.1
=1

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