零点277×343+0点657×279的简便方法?
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0.277×343+0.657×279
=0.277×343+0.657×1000×(0.277+0.002)
=0.277×343+(0.657×1000)×(0.277+0.002)
=0.277×343+657×0.277+0.002×657
=0.277×(343+657)+0.002×657
=0.277×1000+1.314
=277+1.314
=278.314
麻烦请及时采纳回答,谢谢!
=0.277×343+0.657×1000×(0.277+0.002)
=0.277×343+(0.657×1000)×(0.277+0.002)
=0.277×343+657×0.277+0.002×657
=0.277×(343+657)+0.002×657
=0.277×1000+1.314
=277+1.314
=278.314
麻烦请及时采纳回答,谢谢!
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