7.5x0.58+7.5+0.42怎么简便运算

妃尘2022-10-04 11:39:541条回答

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qwertm123 共回答了19个问题 | 采纳率100%
=7.5*(0.58+1)+0.42
=7.5*1.58+0.42
=7.5*2-7.5*0.42+0.42
=15-0.42*(7.5-1)
=15-0.42*6.5
=15-0.42*6-0.42*0.5
=15-2.52-0.21
=15-(2.52+0.21)
=15-2.73
=12.27
1年前

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