数列﹛an﹜的通项公式是an=1-3n,则这个数列是等差数列吗?
数列﹛an﹜的通项公式是an=1-3n,则这个数列是等差数列吗?
数学人气:154 ℃时间:2020-01-26 05:11:45
优质解答
是,公差是-3谢谢,可以告诉我过程吗?等差数列通项公式:an=a1+(n-1)d=(a1-d)+nd所以a1-d=1nd=3n d=3就是公差了
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