答:x/(x-1) -1=m / [(x+1)(x+2)](x-x+1)/(x-1)=m/[(x+1)(x+2)]1/(x+1)=m/[(x+1)(x+2)]x^2+3x+2=mx+mx^2+(3-m)x+2-m=0方程有增根,则增根为x=1或者x=-1或者x=-2分别代入得:1+3-m+2-m=0,2m=6,m=31+m-3+2-m=0恒成立4-6+2m+2-m=0,m=0综上所述,m=3
初中....