(3a^n+1+6a^n+2-9a^n)/3a^n-1是计算题
问题描述:
(3a^n+1+6a^n+2-9a^n)/3a^n-1是计算题
答
(3a^n+1+6a^n+2-9a^n)/3a^n-1
=1/(3a^n)-1
=(1-3a^n)/(3a^n)