x-1/x^2-2x+x-1/2x-x^2-x/x^2-2x怎么做?
问题描述:
x-1/x^2-2x+x-1/2x-x^2-x/x^2-2x怎么做?
秒好评- -
答
(x-1)/(x^2-2x)+(x-1)/(2x-x^2)-x/(x^2-2x)
=(x-1)/(x^2-2x)-(x-1)/(x^2-2x)-x/(x^2-2x)
=-x/(x^2-2x)
=-1/(x-2)