6a的n+2次方+3a的n+1次方-9a的n次方除以3a的n-1次方

问题描述:

6a的n+2次方+3a的n+1次方-9a的n次方除以3a的n-1次方

6a的n+2次方+3a的n+1次方-9a的n次方除以3a的n-1次方
=2a^(n+2-n+1)+a^(n+1-n+1)-3a^(n-n+1)
=2a³+a²-3a