问题
解答题
计算:
(1)(3x2-4x+1)(3x2+4x+1);
(2)(x-2)(x4+16)(x+2)(x2+4)
答案
(1)原式=[(3x2+1)-4x][(3x2+1)+4x]
=(3x2+1)2-(4x)2
=9x4+6x2+1-16x2
=9x4-10x2+1;
(2)原式=(x-2)(x+2)(x2+4))(x4+16)
=(x2-4)(x2+4)(x4+16)
=(x4-16)(x4+16)
=x8-256.