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能简算7.5*23 31*2.5吗?

7.5*23 =7.5*(20+3) =7.5*20+7.5*3 =140+(7+0.5)*3 =140+7*3+7*0.5 =140+21+3.5 =161+3.5 =164.5 第二个同理,采纳吧,下班了,还在给你回答。

7.5x23+31x2.5 =2.5x3x23+31x2.5 =2.5x69+31x2.5 =2.5x(69+31) =2.5x100 =250

7.5╳23+31╳2.5 =2.5x3x23+31x2.5 =2.5x69+31x2.5 =2.5x(69+31) =2.5x100 =250

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