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概括起来讲,等差数列的判定方法有如下四种.一、概念判断法如果数列{an}满足an+1-an=d(常数),那么数列{an}是
To sum up, there are four methods for determining the arithmetic progression. First, the concept judgment method If the sequence {an} satisfies an+1-an=d (constant), then the sequence {an} is