(x+15)/(x+100-15)=4/5 解方程_数学解答

(x+15)/(x+100-15)=4/5 解方程

人气：479 ℃　时间：2020-05-20 06:35:13

解答

(x+15)/(x+100-15)=4/5
(x+15)/(x+85)=4/5
5(x+15)=4(x+85)
5x+75=4x+340
5x-4x=340-75
x=265