Question

x-1/x+2-(x-1)/（x平方-4）=1-3/2-x

Answer 1

通分,（x-1)(x+2)/(x^-4)-(x-1)/(x^2-4)=2/(x-2)

3(x-1)/(x^2-4)-2(x+2)/(x^2-4)=0

(x+1)/(x^2-4)=0

x=-1