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从第 2 项起，每一项与它的前一项的差等

从第 2 项起，每一项与它的前一项的差等. 于同一个常数. 公差. d. ( n － m ) d. md. 大. 小. 等差数列的判定方法： （ 1 ）定义法： （ 2 ）等差中项法： （ 3 ）通项公式法： （ 4 ）利用前 n 项和公式：. 2 n － 1. A. B.

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从第 2 项起，每一项与它的前一项的差等

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  1. 从第2项起，每一项与它的前一项的差等 于同一个常数 公差 d

  2. (n－m)d md

  3. 大 小

  4. 等差数列的判定方法： （1）定义法： （2）等差中项法： （3）通项公式法： （4）利用前n项和公式：

  5. 2n－1

  6. A B

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