x(2y-z)
3x(2x + 3)
4(x-3/2)(x+3/2)
(x - 2)^2
(x -4y)(x+4y)
(3x -1)^2
2y(x -2)^2
(a-b)(3x+2y)
(y-3)(a-1)(a+1)
(x-y)(x-1)(x+1)
-y(2x-1)^2
先用平方差公式得：(3a+2+a-6)[(3a+2)-(a-6)],整理得,8(a-1)(a+4)
(x^2-4)^2=(x+2)^2*(x-2)^2