(x+2/x^2-x-6)+(2x/x^2-3x)-(x+1/x^2-6x+9)
问题描述：
(x+2/x^2-x-6)+(2x/x^2-3x)-(x+1/x^2-6x+9)
差不多的
答
原式=(x+2)/(x+2)(x-3)+2x/x(x-3)-(x+1)/(x-3)²=1/(x-3)+2/(x-3)-(x+1)/(x-3)²=3/(x-3)-(x+1)/(x-3)²=[3(x-3)-(x+1)]/(x-3)²=(2x-10)/(x²-6x+9)