将1/2xy-4x^2y^3+4y^2-x^3按升幂排列
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将1/2xy-4x^2y^3+4y^2-x^3按升幂排列
将1/2xy-4x^2y^3+4y^2-x^3按升幂排列
将1/2xy-4x^2y^3+4y^2-x^3按升幂排列
1/2xy+4y^2-x^3-4x^2y^3
因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y)
(x+y)(x+y+2xy)+(xy+1)(xy-1)(x+y)(x-y)+4(y-1)
XY(XY+3)+(XY+4)+4(X+Y+1)-(X+Y+2)
x-y/x+y=-1/2,x*x-xy-2y*y/x*x-3xy+2y*y的解是多少?同上,请将过程写出,
x²-y²+5x+3y+4(x+y-2xy)(x+y-z)+(xy-1)²
怎么将2x-3xy-2y+3x+4y-2因式分解
若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
(-2xy+2x+5y)-(3xy+2y-2x)-(x+4y+xy)其中x-y=4xy=-1
若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)=
x-y=1,xy=2.求:(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
.已知:x-y=1,xy=-2.求:(-2xy+2 x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6
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
x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x²
4xy-[(x²+5xy-y²)-(3xy-1/2y)]x=3,y=-6
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
化简:3x^2-[5xy-(x^y-3xy)+4x^2y-8xy]
计算:(1)8x^2y^2*(-3x/4y^5) (2)(x+y)^2/xy-y^2*(y-x)^2/xy+y^2