5a^n-2a^n-8a^n+1+6a^n-a^n+1(n为正整数）急死!
问题描述：
5a^n-2a^n-8a^n+1+6a^n-a^n+1(n为正整数）急死!
答
=5a^n-2a^n-8a^n*a+6a^n-a^n*a
=(5-2-8a+6-a)a^n
=9(1-a)a^n
这次应该对了