(4x-3y-2a+b)的2次方-(4x+3y+2a-b)的2次方=?
问题描述:
(4x-3y-2a+b)的2次方-(4x+3y+2a-b)的2次方=?
答
(4x-3y-2a+b)^-(4x+3y+2a-b)^
=(4x-3y-2a+b+4x+3y+2a-b)(4x-3y-2a+b-4x-3y-2a+b)
=8x(-6x-6y-4a+2b)
=-48x^-48xy-32ax+16bx