作业帮x/x^2-1+2/1-x=3化方程,A x+2(x+1)=3(x+1)(x-1) B x-2(x+1)=3(x+1)(x-1)C.x-2(x+1)=3 D.x-2(x+1)=3(x-1)
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x/x^2-1+2/1-x=3化方程,A x+2(x+1)=3(x+1)(x-1) B x-2(x+1)=3(x+1)(x-1)C.x-2(x+1)=3 D.x-2(x+1)=3(x-1)
x/x^2-1+2/1-x=3化方程,A x+2(x+1)=3(x+1)(x-1) B x-2(x+1)=3(x+1)(x-1)C.x-2(x+1)=3 D.x-2(x+1)=3(x-1)
x/x^2-1+2/1-x=3化方程,A x+2(x+1)=3(x+1)(x-1) B x-2(x+1)=3(x+1)(x-1)C.x-2(x+1)=3 D.x-2(x+1)=3(x-1)
x/x^2-1+2/1-x=3
两边同乘以(x^2-1)：
x - 2 (x+1) = 3(x+1)(x-1)
B
x-2(x+1)=3(x+1)(x-1)