题目内容
-3x³+12x²-12x
=-3x(x-2)2
(4)(a+b)(x+y)-3(a+b)(x-y).
(1)4x(a-B)+(B2-a2); (2)(a2+B2)2-4a2B2;
(3)x4+2x2-3; (4)(x+y)2-3(x+y)+2;
(5)x3-2x2-3x; (6)x3-3x2-4x+12;
(7)4a2-B2+6a-3B (8)2x3y+8x2y2+8xy3;