x^2+2x+1/3 x^2-1/2x x^2-x-2/1的最简公分母是
问题描述:
x^2+2x+1/3 x^2-1/2x x^2-x-2/1的最简公分母是
答
3/(x^2+2x+1)=3/(x+1)^2=3(x-1)(x-2)/(x-1)(x-2)(x+1)^2
2x/(x^2-1)=2x/(x+1)(x-1)=2x(x+1)(x-2)/(x-1)(x-2)(x+1)^2
1/(x^2-x-2)=1/(x-2)(x+1)=(x-1)(x+1)/(x-1)(x-2)(x+1)^2