【（x+y+)的2n次方】的3次方÷（-x-y)的2n+1次方,等于?
问题描述：
【（x+y+)的2n次方】的3次方÷（-x-y)的2n+1次方,等于?
答
[(x+y)^2n]^4÷(－x－y)^2n+1
=-(x+y)^8n÷(x+y)^(2n+1)
=-(x+y)^(8n-2n-1)
=-(x+y)^(6n-1)