等差数列-1,4,9,……的通项公式是
问题描述:
等差数列-1,4,9,……的通项公式是
答
an=a1+(n-1)d
=>an=5n-6
等差数列-1,4,9,……的通项公式是
an=a1+(n-1)d
=>an=5n-6