把下列各式分解因式(每题4分,共16分)
(1)(a-3)2+(3-a) (2)x2+16y2-8xy (3) x5-x3 (4)9m2-n2+3m-n
把下列各式分解因式(每题4分,共16分)
(1)(a-3)2+(3-a) (2)x2+16y2-8xy (3) x5-x3 (4)9m2-n2+3m-n
见解析.
解析:(1)原式=(3-a)(3-a+1)=(3-a)(4-a)=(a-3)(a-4)
(2原式=x2+(4y) 2-2x(4x)=(x-4y) 2
(3原式=x3(x2-1)= x3(x+1)(x-1).
(4原式=(3m+n)(3m-n)+(3m-n)=(3m-n)(3m+n+1).