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-
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)
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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
25(x2+ 2xy +y2)-9(x2-2xy+y2)因式分解.x2,y2是x平方,y平方的意思.2xy就是2xy.快,