题目
1/3a^2n -(-7a^n)+(-1)^2n+1 a^n -(2/5a^2n)-5a^n(n为正整数)
提问时间:2020-10-16
答案
n为正整数,2n+1为奇数
(-1)^2n+1=-1
原式=(1/3-2/5)a^2n+(7-1-5)a^n
=-1/15a^2n+a^n
(-1)^2n+1=-1
原式=(1/3-2/5)a^2n+(7-1-5)a^n
=-1/15a^2n+a^n
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