1.39乘2.8减0.039乘28怎么简便计算? - 知识问答

1.39乘2.8减0.039乘28怎么简便计算?

4个回答

1.39×2.8－0.039×28
=1.39×2.8－0.39×2.8
=（1.39－0.39）×2.8
=1×2.8
=2.8

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