解(1)：最简公分母是x(x-1)x分之3=3/x=3(x-1)/[x(x-1)]1-x分之6=6/(1-x)=-6/(x-1)=-6x/[x(x-1)]x的平方-x分之x+5=(x+5)/(x²-x)=(x+5)/[x(x-1)](2)：最简公分母是(x-y)(x-2)(x-y)(x-2)分之3y的平方=3y²/[(x...