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x+5/7x=21

分类: 作业答案 • 2022-04-25 12:00:04

问题描述：

x+5/7x=21

答

x+5/7x=21
(1+5/7)x=21
12/7x=21
x=21*7/12
x=49/4

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520除以一个数，商23余14，则除数是（　　）A. 23B. 22C. 21D. 20
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7x=(13+x)×5－21
物理中的四大基本力是?

x+5/7x=21

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