(5x-4)的平方-(4-5x)=0

问题描述:

(5x-4)的平方-(4-5x)=0

答:
(5x-4)^2-(4-5x)=0
(5x-4)^2+(5x-4)=0
(5x-4)(5x-4+1)=0
(5x-4)(5x-3)=0
解得:
x=4/5或者x=3/5