这个公式是一个求和公式，其中 \( N \) 是自然数的上限，\( a_n \) 是一个序列（或数组）的第 \( n \) 项，而 \( a \) 和 \( 3 \) 是常数项。这个公式表示求和等于两个部分的和，其中一部分是 \( a \)，另一部分是 \( 3 \)。
[ \sum_{n=1}^N a_n = 2a + 3]
- 作者:本地
- 日期:2025年3月29日 12:07
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