(x-2/x+2)+(x^2-20/x^2-4)

问题描述:

(x-2/x+2)+(x^2-20/x^2-4)
坐等,速度,化简

(x-2/x+2)+(x^2-20/x^2-4)=(x-2)²/(x+2)(x-2)+(x²-20)/(x+2)(x-2)=(x²-4x+4+x²-20)/(x+2)(x-2)=(2x²-4x-16)/(x+2)(x-2)=2(x²-2x-8)/(x+2)(x-2)=2(x-4)(x+2)/(x+2)(x-2)=2(x-4)/(x-2)