(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

原式=(x2-4y22-(4x2-y22
=x4-8x2y2+16y4-16x4+8x2y2-y4
=15y4-15x4