题目内容
(1、3小题各4分,2、4小题各5分,共18分)因式分解:
(1) (2) a2-b2+2b-1
(3)x2-10x+25; (4)
(1) (2) a2-b2+2b-1
(3)x2-10x+25; (4)
(1)解:原式= (a-b)(x-y+x+y)=2x(a-b)
(2)解:原式= a2-(b2-2b+1) = a2 - (b-1)2=(a+b-1)(a-b+1)
(3)解:原式=(x-5)2
(4)解:原式=(x2+1+2x)(x2+1-2x)=(x+1)2(x-1)2
(2)解:原式= a2-(b2-2b+1) = a2 - (b-1)2=(a+b-1)(a-b+1)
(3)解:原式=(x-5)2
(4)解:原式=(x2+1+2x)(x2+1-2x)=(x+1)2(x-1)2
略
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