(1)(x+y)^2-4(x+y)-12

来源：学生作业帮编辑：拍题作业网作业帮分类：数学作业时间：2024/05/01 11:48:39

(1)(x+y)^2-4(x+y)-12
(2)12(x+y)^2+11(x+y)(x-y)+2(x-y)^2
(3)5+7(a+1)-6(a+1)^2
(4)(a-2b)^2-8(a-2b)+12
(5)x^6-19x^3y^3-216y^6
(6)(x^2+x+4)^2+8x(x^2+x+4)+15x^2
(7)(x^2+x)^2-14(x^2+x)+24
题目比较多,必将重谢

(1)(x+y)^2-4(x+y)-12=(x+y-6)(x+y+2)
(2)12(x+y)^2+11(x+y)(x-y)+2(x-y)^2=[3(x+y)+2(x-y)]*[4(x+y)+x-y]=(5x+y)(5x+3y)
(3)5+7(a+1)-6(a+1)^2=[5-3(a+1)]*[1+2(a+1)]=(2-3a)(3+2a)
(4)(a-2b)^2-8(a-2b)+12=(a-2b-2)(a-2b-6)
(5)x^6-19x^3y^3-216y^6=(x^3-27y^3)(x^3+8y^3)
(6)(x^2+x+4)^2+8x(x^2+x+4)+15x^2=(x^2+x+4+3x)(x^2+x+4+5x)=(x^2+4x+4)(x^2+6x+4)
(7)(x^2+x)^2-14(x^2+x)+24=(x^2+x-2)(x^2+x-12)=(x+2)(x-1)(x+4)(x-3)

1、x(x-y)(x+y)-x(x+y)^2 1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [（x+y)(x-y)-(x-y)^2+2y(x-y 4/X+1/Y=2,XY=-1,求代数式4Y-X/X-2Y/（x+2y-12Y²/x-2y)的值（x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3) {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 已知4x=9y求(1)x+y/y (2)y-x/2x 1 4(x-y+1)+y(y-2x) 化简求值:(x+y)-(2x+1/2y)-(3x+1/6y)-(4x+1/12y)-(5x+1/20y)-.(10x+1 把4（x-y+1)+y(y-2x)因式分解 4(x-y+1)+y(y-2x) (1)(x^2/x)-y-x-y [(3x-1/2y^2)+3y(x-y/12)]÷[(2x+y)^2-4y(x+1/4y)]