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42×85加42×15用简便方法计算

42×85+42×15 =42×(85+15) =42×100 =4200

=(40+2)×(25+60)+(40+2)×(5+10) =1000+120+200+20 =1340

42×85≠85×40 ~回答完毕~ ~\(^o^)/~祝学习进步~~~

5800÷58+85×42简便计算 =100+85x(40+2) =100+85x40+85x2 =100+3400+170 =3670

42.85-12.85-13.26 =30-13.26 =16.74

g

[186-(42+74)]×85简算过程详细 =【186-116】×85 =70×85 =5950 直接算最简便

85+380÷20-42怎么简便计算: 85+380÷20-42 =85+19-42 =85+20-40-(1+2) =105-40-3 =65-3 =62

2500除以25+85乘以42的简便算 2500÷25+85x42 =100+85x6x7 =100+510x7 =100+3570 =3670

0.85×4.2+0.42×1.5 解:简便计算 =8.5x0.42+0.42x1.5 运用乘法分配律 =(8.5+1.5)x0.42 =10x0.42 =4.2 祝学习进步。

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