(-2x y)^2-(3y-x)(-x-3y)
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(-2xy)^2-(3y-x)(-x-3y)(-2xy)^2-(3y-x)(-x-3y)(-2xy)^2-(3y-x)(-x-3y)(-2xy)^2-(3y-x)(-x-3y)=4x²y&#
(-2x y)^2-(3y-x)(-x-3y)
(-2x y)^2-(3y-x)(-x-3y)
(-2x y)^2-(3y-x)(-x-3y)
(-2x y)^2-(3y-x)(-x-3y)
=4x²y²+(9y²-x²)
=9y²+4x²y²-x²
=9y²-(x²-4xy+4y²)+4y²
=13y²-(x-2y)²
=(y√13+x-2y)(y√13-x+2y)
x(x-y)2-(y-x)3
[2/3x-2/x+y(x+y/3x-x-y)]/x-y/x
化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x
计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x
化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x
计算：x+2y/x-y+2x/y-x-3y/x-y
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
[(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y)
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
化简y(x+y)+(x+y)(x-y)-x^2
因式分解x(x+y)(x-y)-x(x+y)^2
2X(2X-3Y)-3Y(X+Y)
(-2x y)^2-(3y-x)(-x-3y)
（x+2y)^2-(x+y)(3x-y)
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