通分 1/x²-4与x/4-2x x/(x-1)²与1/x²-1
问题描述：
通分 1/x²-4与x/4-2x x/(x-1)²与1/x²-1
答
1/x²-4与x/4-2x 1/x²-4=1/(x-2)(x+2)=2/2(x-2)(x+2)x/4-2x =-x/2(x-2)=-x(x+2)/2(x-2)(x+2)=(-x^2-2x)/2(x-2)(x+2) x/(x-1)²与1/x²-1x/(x-1)²=x/(x-1)(x-1)=x(x+1)/(x-1)(x-1)(x+1...