| 因式分解: (1)3xy2-27x; (2)4ab(a-b)-a3. |
答案:
| (1)3xy2-27x =3x(y2-9) =3x(y+3)(y-3);(2)4ab(a-b)-a3 =4a2b-4ab2-a3 =-a(4b2-4ab+a2) =-a(2b-a)2. |

| 因式分解: (1)3xy2-27x; (2)4ab(a-b)-a3. |
答案:
| (1)3xy2-27x =3x(y2-9) =3x(y+3)(y-3);(2)4ab(a-b)-a3 =4a2b-4ab2-a3 =-a(4b2-4ab+a2) =-a(2b-a)2. |