1,-1/3,1/9,-1/27,1/81······用公式表达此数列,
问题描述:
1,-1/3,1/9,-1/27,1/81······用公式表达此数列,
答
An=(-1)^(n-1)*(1/3)^(n-1)
1,-1/3,1/9,-1/27,1/81······用公式表达此数列,
An=(-1)^(n-1)*(1/3)^(n-1)