(x-2)/(x+2)-16/(x-4)=1 /(x-4)=1 (x-4x+4-16)=x-4 x-4x-12 =x-4 4x =-4+12 x=8/4 x=2 因为x=2,式子产生增根,所以x无解 2.5/x+（x-1）/（x-x）=0 5/x+(x-1)/x(x-1) =0 5/x+1/x =0 5/x+1 =0 5/x =-1 x =-1/5 ...