(3x-2y)2(3x+2y)2(9x2+4y2)2.

问题描述:

(3x-2y)2(3x+2y)2(9x2+4y22

原式=[(3x-2y)(3x+2y)]2(9x2+4y22
=(9x2-4y22(9x2+4y22
=[(9x2-4y2)(9x2+4y2)]2
=(81x4-16y42