2x/(x^2+x)-1/x=5/(x+1)怎么做?
问题描述：
2x/(x^2+x)-1/x=5/(x+1)怎么做?
急!
答
2x/(x^2+x)-1/x-5/(x+1)=2x/[x(x+1)]-(x+1)/[x(x+1)]-5/(x+1)
=(x-1)/[x(x+1)]-5x/[x(x+1)]
=-(4x+1)/[x(x+1)]
=0
4x+1=0
x=-1/4