(x+2y)2(x-2y)2-(2x+y)2(2x-y)2.
问题描述:
(x+2y)2(x-2y)2-(2x+y)2(2x-y)2.
答
原式=(x2-4y2)2-(4x2-y2)2
=x4-8x2y2+16y4-16x4+8x2y2-y4
=15y4-15x4.