用简便方法计算下面各题 0.75×42.7+57.3-57.3×0.25

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2025-06-29 05:56:40
推荐回答(2个)
回答1:

原式=0.75×42.7+(1-0.25)×57.3
=0.75×42.7+0.75×57.3
=0.75×(42.7+57.3)
=75

回答2:

=75