(x的2次方-3x+2)分之(x-1)-(x的2次方+3x+2)分之(x+1)-(x的2次方-4)分之x的2次方_数学解答

(x的2次方-3x+2)分之(x-1)-(x的2次方+3x+2)分之(x+1)-(x的2次方-4)分之x的2次方

人气：281 ℃　时间：2020-06-22 10:47:08

解答

=(x-1)/(x-2)(x-1)-(x+1)/(x+2)(x+1)-x²/(x+2)(x-2)
=1/(x-2)-1/(x+2)-x²/(x+2)(x-2)
=[(x+2)-(x-2)-x²]/(x+2)(x-2)
=(4-x²)/(x²-4)
=-1