x(x+y)²-4x的三次方y²
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x(x+y)²-4x的三次方y²
![x(x+y)²-4x的三次方y²](/uploads/image/z/5990231-47-1.jpg?t=x%28x%2By%29%26%23178%3B-4x%E7%9A%84%E4%B8%89%E6%AC%A1%E6%96%B9y%26%23178%3B)
x(x+y)^2-4x^3y^2
=x((x+y)^2-4x^2y^2)
=x(x+y-2xy)(x+y+2xy)
=x((x+y)^2-4x^2y^2)
=x(x+y-2xy)(x+y+2xy)
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