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等差数列S_n的最值问题,是数列中常见题型之一。如何根据题目的不同条件,选用简便的解题方法,下面就此举例予以说明。
The problem of the maximum value of the arithmetic sequence S_n is one of the common questions in the sequence. How to choose a simple problem-solving method according to different conditions of the topic, as an example to illustrate below.