把代数式3x3-6x2y+3xy2因式分解,结果正确的是( )
A.x(3x+y)(x-3y) B.3x(x2-2xy+y2)
C.x(3x-y)2 D.3x(x-y)2
D.3x3-6x2y+3xy2=3x(x2-2xy+y2)
=3x(x-y)2.