因式分解:3(x+y)(x-y)-(x-y)²

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因式分解:3(x+y)(x-y)-(x-y)²

因式分解:3(x+y)(x-y)-(x-y)²
因式分解:3(x+y)(x-y)-(x-y)²

因式分解:3(x+y)(x-y)-(x-y)²
3(x+y)(x-y)-(x-y)²
=(x-y)(3x+3y-(x-y))
=(x-y)(2x+4y)
=2(x-y)(x+2y)

3(x+y)(x-y)-(x-y)²
=3x²-3y²-x²+2xy-y²
=2x²+2xy-4y²

3(x+y)(x-y)-(x-y)²
3(x-y)²-(x-y)²
2(x-y)²