5/(x²+x)-2/(x²-x)=6/(x²-1)

5/(x²+x)-2/(x²-x)=6/(x²-1)
5/(x²+x)-2/(x²-x)=6/(x²-1)

5/(x²+x)-2/(x²-x)=6/(x²-1)
两边乘以x(x+1)(x-1)得
5(x-1)-2(x+1)=6x
5x-5-2x-2=6x
-3x=7
x=-7/3
检验:x=-7/3是方程的解
2、1) -1
2) -9
3) x