① 2x/(x^2+2x-3) +1/(x+3) =1
问题描述：
① 2x/(x^2+2x-3) +1/(x+3) =1
② 2/(^2-1)+ (x-2)/x(x-3) = 1/(x^2+3x)
答
1.2x/(x+3)(x-1)+(x-1)/(x+3)(x-1)=1
(3x-1)/(x+3)(x-1)=1
3x-1=x^2+2x-3
x^2-x-2=0
x=-1 x=2