(x-45)/(x-20)=0.65这个方程怎么解
问题描述:
(x-45)/(x-20)=0.65这个方程怎么解
答
(x-45)/(x-20)=0.65
(x-45)/(x-20)=65/100
(x-45)/(x-20)=13/20
13(x-20)=20(x-45)
13x-260=20x-900
20x-13x=900-260
7x=640
x=640/7
经检验,满足题意