分解因式 x²-2xy+y²-9 (x+y)²-4(x+y)
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分解因式 x²-2xy+y²-9 (x+y)²-4(x+y)
分解因式 x²-2xy+y²-9 (x+y)²-4(x+y)
分解因式 x²-2xy+y²-9 (x+y)²-4(x+y)
x²-2xy+y²-9
=(x-y)²-3²
=[(x-y)+3][(x-y)-3]
=(x-y+3)(x-y-3)
(x+y)²-4(x+y)
=(x+y)[(x+y)-4]
=(x+y)(x+y-4)
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