(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
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(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)
x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x²
(x+y)(x-y)+4(y-1)
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12(x+y)^3(y-x)/【4(x+y)^2(x-y)】
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y(y+2)+4x(x-y-1)因式分解是多少
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
4(x+2)=1-5y 4(x+y)-3(x-y)=12
先化简再求值; 解方程组 x(x-y)-y(x+y)+2xy 其中x=2 ,y=-22.x[x-x(x-1)],其中x=-2解方程组4x+3y=12x-y=32.y+1=2x 4x-y=2 3.2x+2y=0 2x-y+24=0
把(x+y),(x-y)个作为一个整体合并同类项1,7(x+y)-2(x+y)-4(x+y)+2(x+y)2,(x-y)²+2(x-y)-(x-y)-2(x-y)²
(1)x^2*x^8+x^13/x^3 (2)a^19/a^12/a^3 (3) (x-2y)^5/(2y-x)^3 (4)(x-y)^5/(x-y) (5)(x-y)^6/(y-x)^4
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