2x(x-1)＋2=x(x+1)
问题描述：
2x(x-1)＋2=x(x+1)
答
l两边打开括号，乘进去
2x^2-2x+2=x^2+x
x^2-3x+2=0
(x-1) (x-2)=0
x=1,x=2
答
2x^2-2x+2=x^2+x
x^2-3x+2=0
(x-2)(x-1)=0
x=2或X=1
答
2x^2-2x+2=x^2+x
x^2-3x+2=0
(x-2)(x-1)=0
x=2,x=1