4.25x9.9+42.5怎么简算?
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展开全部
=4.25*(9.9+10)
=4.25*19.9
=4.25*(20-0.1)
=4.25*20-4.25*0.1
=85-0.425
=84.575
=4.25*19.9
=4.25*(20-0.1)
=4.25*20-4.25*0.1
=85-0.425
=84.575
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展开全部
=4.25×(10-0.1)+42.5
=42.5-0.425+42.5
=85-0.425
=84.575
=42.5-0.425+42.5
=85-0.425
=84.575
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