答：
【x方-1分之2(x+1)】+1=0
2(x+1)/(x^2-1)+1=0有增根,x^2-1≠0,x≠-1并且x≠1
2(x+1)/(x^2-1)=-1
2x+2=1-x^2
x^2+2x+1=0
x=-1
增根为x=-1