化简x^2-4x+4/2x-4 3x^2-9x-12/x^2+2x+1 x^2-7x+12/-x^2+9x-20 xy-x-y+1/y^2-2y+1(1)x^2-4x+4/2x-4(2) 3x^2-9x-12/x^2+2x+1 (3)x^2-7x+12/-x^2+9x-20 (4)xy-x-y+1/y^2-2y+1

来源：学生作业帮助网 编辑：作业帮 时间：2024/11/17 08:30:02

化简x^2-4x+4/2x-4 3x^2-9x-12/x^2+2x+1 x^2-7x+12/-x^2+9x-20 xy-x-y+1/y^2-2y+1(1)x^2-4x+4/2x-4(2) 3x^2-9x-12/x^2+2x+1 (3)x^2-7x+12/-x^2+9x-20 (4)xy-x-y+1/y^2-2y+1
化简x^2-4x+4/2x-4 3x^2-9x-12/x^2+2x+1 x^2-7x+12/-x^2+9x-20 xy-x-y+1/y^2-2y+1
(1)x^2-4x+4/2x-4
(2) 3x^2-9x-12/x^2+2x+1
(3)x^2-7x+12/-x^2+9x-20
(4)xy-x-y+1/y^2-2y+1

化简x^2-4x+4/2x-4 3x^2-9x-12/x^2+2x+1 x^2-7x+12/-x^2+9x-20 xy-x-y+1/y^2-2y+1(1)x^2-4x+4/2x-4(2) 3x^2-9x-12/x^2+2x+1 (3)x^2-7x+12/-x^2+9x-20 (4)xy-x-y+1/y^2-2y+1
(1)x^2-4x+4/2x-4
=(x-2)^2/2(x-2)
=x-2/2
(2)3x^2-9x-12/x^2+2x+1
=3(x^2-3x-4)/(x+1)^2
=3(x+1)(x-4)/(x+1)^2
=3(x-4)/x+1
(3)原式=(x-6)(x-1)/-(x-1)(x+10）
=x-6/-(x+10)
(4)原式=x(y-1)-(y-1)/(y-1)^2
=(x-1)(y-1)/(y-1)^2
=x-1/y-1
有不懂的可以追问,对答案满意请给个满意答案就行了.

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