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1.35x4.2x0.8简便算法

1.35×4.2×0.8 =1.35×0.8×4.2 =1.08×4.2 =1×4.2+0.08×4.2 =4.2+0.336 =4.536 请点个采纳呗,谢谢!

=1.35/1.35x0.8 =1.35/1.35x1/0.8 =1x5/4 =5/4

拆括号,里面变除法

8.7+1.2x0.35 =8.7+(1+0.2)x0.35 =8.7+1x0.35+0.2x0.35 =8.7+0.35+0.07 =9.12

1.35×4.2×0.8=4.536 ~回答完毕~ ~\(^o^)/~祝学习进步~~~

解答题

8.7+(1+0.2)×0.35=8.7+1×0.35+0.2×0.35=8.7+0.35+0.07=9.12

3.5×0.19=3.5×(2-0.01)=7-0.35=6.650.35×8.1=0.35×8+0.35×0.1=2.8+0.035=2.835

这道题所谓简便算法,就是利用乘法规则,合并两项。但是这道题目好像不对吧。 就按照这一题的话,题目简便算法: 57.8×1.35+4.22×0.135=578×0.135+4.22×0.135=(578+4.22)×0.135=582.22×0.135=78.5997. 重新检查一下题目,是不是57.8×0.135+4.2...

20.1x35.22-3.522 =20.1x35.22-35.22x0.1 =(20.1-0.1)x35.22 =20x35.22 =704.4

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