因式分解:X²-Y²-(X+Y)²

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因式分解:X²-Y²-(X+Y)²因式分解:X²-Y²-(X+Y)²因式分解:X²-Y²-(X+Y)²=(x+

因式分解:X²-Y²-(X+Y)²
因式分解:X²-Y²-(X+Y)²

因式分解:X²-Y²-(X+Y)²
=(x+y)(x-y)-(x+y)²
=(x+y)[(x-y)-(x+y)]
=-2y(x+y)

原式等于-2y(x+y)