化简:-(x^2-2xy-y^2)+(5x^2-2xy-3y^2)
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化简:-(x^2-2xy-y^2)+(5x^2-2xy-3y^2)化简:-(x^2-2xy-y^2)+(5x^2-2xy-3y^2)化简:-(x^2-2xy-y^2)+(5x^2-2xy-3y^2)-
化简:-(x^2-2xy-y^2)+(5x^2-2xy-3y^2)
化简:-(x^2-2xy-y^2)+(5x^2-2xy-3y^2)
化简:-(x^2-2xy-y^2)+(5x^2-2xy-3y^2)
-(x^2-2xy-y^2)+(5x^2-2xy-3y^2)
=(-1+5)x^2+(2-2)xy+(1-3)y^2
=4x^2-2Y^2
化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy]
化简x^-y^/x^-2xy+y^
化简(3x^2-5xy)+{-x^2-[-3xy+2(x^2-xy)+y^2]}
5x^2y-3xy^2+4xy-14xy^2+4xy-2x^2y（化简）
化简(X-5)*(Y+2)=XY
化简:5x-y-2(xy)
(-2x)²×（xy+y²）-5x（x-y)×xy化简.
x^2y-2xy+y化简
((xy+2)(xy-2)-2x²y²+5(xy-y)²)÷(2xy)
化简:-(x^2-2xy-y^2)+(5x^2-2xy-3y^2)
化简 -(x^2-2xy-y^2)+(5x^2-2xy-3y^2)
化简-(x方-2xy-y方)+(5x方-2xy-3y方)
因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6
化简4xy+(-2y²+3xy+x²)-(-5xy+x²+y²）
化简：xy+5x/y^2+10y+25
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2)
x^2-xy/xy-y^2约分