分解因式 (1).x²-2xy+y²-9 (2).(x+y)²-4(x+y)
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分解因式 (1).x²-2xy+y²-9 (2).(x+y)²-4(x+y)
分解因式 (1).x²-2xy+y²-9 (2).(x+y)²-4(x+y)
分解因式 (1).x²-2xy+y²-9 (2).(x+y)²-4(x+y)
(1).x²-2xy+y²-9
=(x-y)²-9
=(x-y+3)(x-y-3)
(2).(x+y)²-4(x+y)
=(x+y)(x+y-4)
(1)原式=(x-y)^2-3^2=(x-y+3)(x-y-3)
(2)原式=(x+y)(x+y-4)
(1).x²-2xy+y²-9
=(x+y)²-9
=(x+y-3)(x+y+3)
(2).(x+y)²-4(x+y)
=(x+y)(x+y-4)