1.9x^2+1=6x

问题描述:

1.9x^2+1=6x
2.4x^2=(x-2)^2
 

其实不难的:
(1).9x^2+1=6x
9x^2-6x+1=0
(3x-1)^2=0
解得:x1=x2=1/3
(2).4x^2=(x-2)^2
4x^2-(x-2)^2=0
(2x+x-2)(2x-x+2)=0
(3x-2)(x+2)=0
解得:x1=2/3,
x2=-2