分解因式: (1)3a4bc-12a3b2c+12a2b3c; (2)16(a-b)2-9(a+b)2
问题描述:
分解因式:
(1)3a4bc-12a3b2c+12a2b3c;
(2)16(a-b)2-9(a+b)2
答
(1)3a4bc-12a3b2c+12a2b3c,
=3a2bc(a2-4ab+4b2),
=3a2bc(a-2b)2;
(2)16(a-b)2-9(a+b)2,
=[4(a-b)+3(a+b)][4(a-b)-3(a+b)],
=(7a-b)(a-7b).