(-2x²y 6x³y⁴-8xy)除以(-2xy)

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(-2x²y 6x³y⁴-8xy)除以(-2xy)
已知x-xy=8,xy-y=-9,求x+y-2xy的值

x-xy=8(1)xy-y=-9(2)则有(1)-(2):X-XY-XY+Y=X+Y-2XY=8-(-9)=17

已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值

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因式分解 2x^2y-8xy^2+8y

原式=2y(x²-4x+4)=2y(x-2)²

因式分解:8(x-2y)-x(7x+y)+xy.

8(x平方-2y平方)-x(7x+y)+xy=8x平方-16y平方-7x平方-xy+xy=x平方-4y平方=(x-2y)(x+2y)手机提问的朋友在客户端右上角评价点【满意】即可.再问:太棒了!连我这

(xy-x^2)乘以(xy)/(x-y)

对.前提是x不等于y

-2xy-4x²y+8三次方y

原式=2xy(4x²-2x-1)再问:求过程再答:没有提取公因式

(x+y-2xy)(x+y-2)+(1-xy)²

(x+y-2xy)(x+y-2)+(1-xy)^2=(x+y)^2-2(1+xy)(x+y)+4xy+1-2xy+x^2y^2=(x+y)^2-2(1+xy)(x+y)+(1+xy)^2=(x+y)^

(x^2-xy)y÷y-x/xy怎么做?

=xy(x-y)×[-xy/(x-y)]=-(xy)²=-x²y²

方程组,x平方-xy+2x=0,x平方-2xy+y+8=0,

X²-XY+2X=O提公因数X即X(X-Y+2)=0则X=0或X-Y+2=0假如X=0那么代入X²-2XY+Y+8=0解得Y=﹣8即X=0Y=﹣8假如X≠0则X-Y+2=0即X=Y

已知1/x+1/y=8,求2x-3xy+2y/x+2xy+y的值

1/x+1/y=(x+y)/xy=8x+y=8xy2x-3xy+2y/x+2xy+y=[2(x+y)-3xy]/[(x+y)+2xy]=(16xy-3xy)/(8xy+2xy)=13xy/10xy=1

(x^2+xy/x-y)/(xy/x-y)计算

【x²+xy/(x-y)】/【xy/(x-y)】=【x²(x-y)/(x-y)+xy/(x-y)】/【xy/(x-y)】={【x²(x-y)+xy】/(x-y)}/【xy

-4x²y-8xy²+2x²y-3xy²

-4x²y-8xy²+2x²y-3xy²=-2x²y-11xy²=-xy(2x+11y)

已知2x+xy=10,3y+2xy=6.求4x+8xy+9y=?

1、已知2x²+xy=10,3y²+2xy=6,求4x²+8xy+9y²的值为?分析:通过观察,可以把8xy拆成2xy+6xy,分别于剩余的两项组合,并提取公因

xy/3x+2y=1/8 xy/2x+3y=1/7

设X=kY.kY^2/(3k+2)Y=1/8kY^2/((2k+3)Y=1/7由上式得:3k+2=8kY,2k+3=7kY所以2/(8Y-3)=3/(7Y-2)所以Y=1/2,X=1

x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值

(5xy+4x+7y)+(6x-3xy)-(4xy-3y)=5xy+4x+7y+6x-3xy-4xy+3y=(5xy-3xy-4xy)+(4x+6x)+(7y+3y)=-2xy+10x+10y=-2x

1.已知x--xy=8,xy--y=--9,求x+y--2xy的值

那9是负的吗~如果不是等于负1,如果是负九等于十七~用第一个等式减第二个等式

x-y/x²÷x²-2xy+y²/xy*(xy-x²)

(x-y)/x²÷(x²-2xy+y²)/xy×(xy-x²)=(x-y)/x²÷(x+y)²/xy×x(y-x)=(x-y)²/

(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)

原式=-x²y+2xy²+2x²y²-4xy³-3x³+27x³y-18x²y²+2x²y-18x&

(1) -3X^-2XY-8XY-(-5Y^2)-2X^2-Y^2

(1)-3X^-2XY-8XY-(-5Y^2)-2X^2-Y^2=-3x^2-2xy-8xy+5y^2-2x^2-y^2=-5x^2-10xy+4y^2(2)3(-2+3X-X^2)-(4-3X+X^