xy-2x+6y-12 xy+8
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xy-2x+6y-12xy+8xy-2x+6y-12xy+8xy-2x+6y-12xy+8xy-2x+6y-12xy+8=xy-12xy-2x+6y+8=-11xy-2x+6y+8或者xy-2x+6y
xy-2x+6y-12 xy+8
xy-2x+6y-12 xy+8
xy-2x+6y-12 xy+8
xy-2x+6y-12 xy+8
=xy-12 xy-2x+6y+8
=-11xy-2x+6y+8
或者
xy-2x+6y-12
=(xy-2x)+(6y-12)
=x(y-2)+6(y-2)
=(x+6)(y-2)
那么 xy+8是干什么的?
整理：-5x+2y=12 ① -2x+8y=12 ②
①×4-② -18x=36 x=-2 代入① 10+2y=12 y=1
∴方程解为：x=-2 y=1
xy-2x+6y-12 xy+8
[ 2x-6y][8-9xy]÷xy等于?
诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy)
12X^2+XY-6Y^2
xy-2{xy-[3x^2y-(4xy^2+0.5xy)]+4x^2y}+6xy^2
（X-3xy+4xy-y）-[-2x-2（xy-3/2xy）-y]+6xy的过程
3xy(x^2y-xy^2+xy)-xy^2(2x^2-6xy+2x)过程
x^2-xy-6y^2+3xy+y+2
3x-2xy-8-2x+6xy-x²+6、-x²+2xy-y²-3x²-2xy+2y²合并同类项
x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值
(-4x(2xy+3xy^2)+12(x^2y)^2y^3)÷（-6xy）
化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy]
因式分解xy(xy+2)+6(xy+8)-4(x+y-2)^2-16(x+y+1)谢谢
（12x^2y-8xy^2+16xy）/-3x+2y-4=?
(12x^2y-8xy^2+16xy）/-3x+2y-4=?
解方程组：xy/x+y=-6(1) 2xy/x+2y=12(2)
(8X^3Y-6X^2Y^2-2XY^3)/(3XY)
(8X^3Y-6X^2Y^2-2XY^3)/(3XY)