(x+2y)^7÷(x+2y)^2÷(-x-2y)^3该怎么算?
问题描述:
(x+2y)^7÷(x+2y)^2÷(-x-2y)^3该怎么算?
答
(x+2y)^7÷(x+2y)^2÷(-x-2y)^3
=-(x+2y)^(7-2)÷(x+2y)³
=-(x+2y)^(5-3)
=-(x+2y)²