分式的加减:(x-1/x^2-3x+2)-(x+2/x^2+3x+2)的步骤_数学解答

分式的加减:(x-1/x^2-3x+2)-(x+2/x^2+3x+2)的步骤

人气：132 ℃　时间：2020-05-12 08:59:05

解答

原式=(x-1)/(x-1)(x-2)-(x+2)/(x+1)(x+2)
=1/(x-2)-1/(x+1)
=(x+1-x+2)/(x-2)(x+1)
=3/(x²-x-2)