因式分解:(1)x2-9-2xy+y2 (2)x2+2x+1-y2 (3)4a2-b2-4a+1 (4)9x2-1-6xy+y2

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因式分解:(1)x2-9-2xy+y2 (2)x2+2x+1-y2 (3)4a2-b2-4a+1 (4)9x2-1-6xy+y2

因式分解:(1)x2-9-2xy+y2 (2)x2+2x+1-y2 (3)4a2-b2-4a+1 (4)9x2-1-6xy+y2
因式分解:(1)x2-9-2xy+y2 (2)x2+2x+1-y2 (3)4a2-b2-4a+1 (4)9x2-1-6xy+y2

因式分解:(1)x2-9-2xy+y2 (2)x2+2x+1-y2 (3)4a2-b2-4a+1 (4)9x2-1-6xy+y2
(1)x2-9-2xy+y2
=(x-y)²-9
=(x-y+3)(x-y-3)
(2)x2+2x+1-y2
=(x+1)²-y²
=(x+1+y)(x+1-y)
(3)4a2-b2-4a+1
=(2a-1)²-b²
=(2a-1+b)(2a-1-b)
(4)9x2-1-6xy+y2
=(3x-y)²-1
=(3x-y+1)(3x-y-1)