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(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、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)