几道初二的分式方程!
问题描述：
几道初二的分式方程!
(1) x+1/x-2加上x+2/x-1=2
(2) x-8/x-7减去x/7-x=8
(3)x/2x-5加上5/5-2x=1
(40 2x/2x-1加上x/x-2=2
答
1x+1/x-2+x+2/x-1=2
(x+1)(x-1)/(x-2)(x-1)+ (x+2)(x-2)/(x-2)(x-1)=2
2x^2-3=2x^2-6x+4
x=6/7
2 x-8/x-7-x/7-x=8
x-8/x-7+x/x-7=8
2x-8=8x-56
6x=48
x=8
3 x/2x-5+5/5-2x=1
x/2x-5-5/2x-5=1
x-5=2x-5
x=2x
x=0
4 2x/2x-1+x/x-2=2
2x^2-4x/(2x-1)(x-2)+2x^2-x/(2x-1)(x-2)=2
4x^2-5x=4x^2-10x+4
5x=4
x=5/4