1 2x^2-4x2 (x^2+y)^2-4x^2y^2就这么多先

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12x^2-4x2(x^2+y)^2-4x^2y^2就这么多先12x^2-4x2(x^2+y)^2-4x^2y^2就这么多先12x^2-4x2(x^2+y)^2-4x^2y^2就这么多先2x^2-4x

1 2x^2-4x2 (x^2+y)^2-4x^2y^2就这么多先
1 2x^2-4x
2 (x^2+y)^2-4x^2y^2
就这么多先

1 2x^2-4x2 (x^2+y)^2-4x^2y^2就这么多先
2x^2-4x
=2x(x-2)
(x^2+y^2)^2-4x^2y^2 平方差公式
=(x^2+2xy+y^2)(x^2-2xy+y^2)
=(x+y)^2 (x-y)^2

1 2x^2-4x
=2x(x-2)
2 (x^2+y)^2-4x^2y^2
=(x^2+y^2-2xy)(x^2+y^2+2xy)
=(x-y)^2*(x+y)^2

1 2x^2-4x
=2x(x-2)
2 (x^2+y)^2-4x^2y^2
=(x²+y²)²-(2xy)²
=(x²+y²+2xy)(x²+y²-2xy)
=(x+y)²(x-y)²

2x^2-4x
=2x(x-2)
(x^2+y)^2-4x^2y^2
=(x^2+y)^2-(2xy)^2
=(x^2+y+2xy)(x^2+y-2xy)

2x^2-4x=2x(x-2)
(x^2+y)^2-4x^2y^2=(x^2+y+2xy)(x^2+y-2xy)