3.57÷1.25简便计算简便计算~ - 知识问答

3.57÷1.25简便计算简便计算~

1个回答

3.57÷1.25
=3.57÷5/4
=(3.5+0.07)×4/5
=3.5×4/5+0.07×4/5
=0.7×4+0.07×0.8
=2.8+0.056
=2.856

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