分解因式:an+an+2+a2n=_________.
如果x+y=5,xy=2,求和的值
把下列各式分解因式:
(1) (2)
(3) (4)
(5) (6)
(7)15 (8)6x(x+y)-4y(x+y)
(9) (10)
把(x-y)2-(y-x)分解因式为( )
A.(x-y)(x-y-1) B.(y-x)(x-y-1)
C.(y-x)(y-x-1) D.(y-x)(y-x+1)
把多项式(3a-4b)(7a-8b)+(11a-12b)(8b-7a)分解因式的结果( )
A. 8(7a-8b)(a-b) B. 2(7a-8b)2
C. 8(7a-8b)(b-a) D. -2(7a-8b)
-6xyz+3xy2-9x2y的公因式是( )
A. -3x B. 3xz C. 3yz D. -3xy