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递归、回溯算法常用数学基础公式
2020-11-06 21:40:00 【会开车的架构师】
等比数列
求和公式:Sn=(首项-末项公比)÷(1-公比)
通项公式: an=a1q^(n-1)
等差数列
通项公式:an = a1 + (n-1)*d
求和公式:(a1+an)*n/2
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