x(x+y)²-4x的三次方y²

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x(x+y)²-4x的三次方y²x(x+y)²-4x的三次方y²x(x+y)²-4x的三次方y²x(x+y)^2-4x^3y^2=x((x+

x(x+y)²-4x的三次方y²
x(x+y)²-4x的三次方y²

x(x+y)²-4x的三次方y²
x(x+y)^2-4x^3y^2
=x((x+y)^2-4x^2y^2)
=x(x+y-2xy)(x+y+2xy)

原式=x[(x+y)^2-4x^2y^2]
=x(x+y+2xy)(x+y-2xy)

x(x+y)²-4x的三次方y²
=x[(x+y)²-4x²y²]
=x(x+y+2xy)(x+y-2xy)