算术35.6乘以3.14加上31.4乘以1.23加 - 知识问答

算术35.6乘以3.14加上31.4乘以1.23加上0.479乘以686怎么简算

3个回答

35.6×3.14+31.4×1.23+0.479×68.6
=3.56×31.4+31.4×1.23+0.479×6.6
=（3.56+1.23）×31.4+0.479×68.6
=4.79×（31.4+68.6)
=4.79×100
=479

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