(4x*4y-y-x-2x*2y)*a=?
问题描述:
(4x*4y-y-x-2x*2y)*a=?
答
(4x*4y-y-x-2x*2y)*a
=(16xy-y-x-4xy)a
=(12xy-y-x)a
=12axy-ay-ax