(1).x^2-8xy+7y^2(2).4x^2+9xy+2y^2(3).2x^2+7xy+3y^2(4).6x^2+xy-2y^2
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(1).x^2-8xy+7y^2(2).4x^2+9xy+2y^2(3).2x^2+7xy+3y^2(4).6x^2+xy-2y^2
(1).x^2-8xy+7y^2
(2).4x^2+9xy+2y^2
(3).2x^2+7xy+3y^2
(4).6x^2+xy-2y^2
(1).x^2-8xy+7y^2(2).4x^2+9xy+2y^2(3).2x^2+7xy+3y^2(4).6x^2+xy-2y^2
(1).x^2-8xy+7y^2 =(x-y)(x-7y)
(2).4x^2+9xy+2y^2 =(4x+y)(x+2y)
(3).2x^2+7xy+3y^2 =(2x+y)(x+3y)
(4).6x^2+xy-2y^2=(2x-y)(3x+2y)
(x-y)(x-7y)
(4x+y)(x+2y)
(2x+y)(x+3y)
(3x+2y)(2x-y)
1 x^2-8xy+7y^2=(x-y)(x-7y)
2 4x^2+9xy+2y^2=(4x+y)(x+2y)
3 2x^2+7xy+3y^2 =(2x+y)(x+3y)
4 6x^2+xy-2y^2=(3x+2y)(2x-y)
7x^2y-[xy+4(xy^2+1/8xy)-3x^2y]答对给分
因式分解:8(x-2y)-x(7x+y)+xy.
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
.(x+y-2)(x+y-2xy)+(xy-1)^2
已知1/x-1/y=2,求3x+7xy-3y/2x-3xy-2y答案是1/x-1/y=2(y-x)/xy=2 得:x-y=-2xy(3x+7xy-3y)/(2x-3xy-2y)=[3(x-y)+7xy]/[2(x-y)-3xy]=(-6xy+7xy)/(-4xy-3xy)=xy/(-7xy)=-1/7 谁能帮我解释一下=[3(x-y)+7xy]/[2(x-y)-3xy]=(-6xy+7xy)/(-4xy-3xy) 是怎
(x+y)(x+y+2xy)+(xy+1)(xy-1)(x+y)(x-y)+4(y-1)
化简:3x^2-[5xy-(x^y-3xy)+4x^2y-8xy]
2 3 2 3 2 3 2x y+(-4x y)-(-3x y) 2 2 (3x+x-5)-(4-x+7x) 2 2 (8xy-3y)-5xy-2(3xy-2x)12 2 2 2 __ 5(3x y-xy)-(xy-3x y)其中x=2 y=-1算出来
计算3xy[2xy-x(y-2)+x-1]
化简求值x-4y/2x-7xy+3y×x-2xy-3y/2x+3xy-2y÷3x-6y/4x-4xy+y,其中:x=1999,y=-1
{(x-y/x^2-2xy+y^2)-(xy+y^2/x^2-y^2)}*(xy/y-1)
(1).x^2-8xy+7y^2(2).4x^2+9xy+2y^2(3).2x^2+7xy+3y^2(4).6x^2+xy-2y^2
x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值
xy/3x+2y=1/8 xy/2x+3y=1/7这是一个方程组,
解方程组xy/3x+2y=1/8, xy/2x+3y=1/7
1.(xy-1)^2-(x+y-2xy)(2-x-y)2.(x+y)(x+y+2xy)+(xy-1)(xy+1)
因式分解xy(xy+2)+6(xy+8)-4(x+y-2)^2-16(x+y+1)谢谢
[-xy^2(2x+y)-8xy)-x^2y)]除以2xy=计算