(2x+2y-3)(2x-2y+3)等于多少
问题描述:
(2x+2y-3)(2x-2y+3)等于多少
计算题
答
(2x+2y-3)(2x-2y+3)
=(2x+(2y-3))(2x-(2y-3))
=(2x)²-(2y-3)²
=4x²-(4y²-12y+9)
=4x²-4y²+12y-9