31.4*6.25-0.314+3.14*37.6 怎么巧算,
3个回答
31.4*6.25-0.314+3.14*37.6
=3.14*62.5-0.1*3.14+3.14*37.6
=3.14*(62.5+37.6-0.1)
=3.14*100
=314
相关问题
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