4.2×1.9-6.29×42怎么样简算
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4.2×1.9-6.29×42
=42×0.19-6.29×42
=42×(0.19-6.29)
=42×(-6.1)
=(40+2)×(-6.1)
=40×(-6.1)+2×(-6.1)
=-244-12.2
=-256.2
咨询记录 · 回答于2022-05-30
4.2×1.9-6.29×42怎么样简算
4.2×1.9-6.29×42=42×0.19-6.29×42=42×(0.19-6.29)=42×(-6.1)=(40+2)×(-6.1)=40×(-6.1)+2×(-6.1)=-244-12.2=-256.2
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