解方程
(1)3/(x-2)=5/X
3x=5x-10
x=5
(2)1-1/(x-5)=x/(x+5 )
x²-25-x-5=x²-5x
4x=30
x=7.5
计算 (3)(x-2/(x^2-1))+x+1/x^2+2x+1