(x^2+x)分之7-(x^2-1)分之6=(x-x^2)分之37/(x^2+x)-6/(x^2-1)=3/(x-x^2)7/[x(x+1)]-6/[x(x-1)]=-3/[x(x-1)]分母最小公倍数是x(x-1)(x+1)等号左右同乘x(x-1)(x+1)得7(x-1)-6(x+1)=-3(x+1)7(x-1)-3(x+1)=07x-7-3x-3=04...