找规律:1,2,4,7,11,16,22,29.找公式
我是初中的,暂时还不懂什么通项公式,请用初中的知识,
for excmple 1 3 5 7 9 :2n-1
人气:169 ℃ 时间:2019-10-28 22:02:21
解答
令A1=1,
则通项公式为:An=A(n-1)+(n-1).
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