Question

7/xx+x+1/xx-1=2/xx-x

Answer 1

7/x(x+1)-1/(x+1)(x-1)=2/x(x-1)

两边乘x(x+1)(x-1)

7(x-1)-x=2(x+1)

7x-7-x=2x+2

4x=9

x=9/4

分式方程要检验

经检验,x=9/4是方程的解