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[数列] 如果一个数列在不是常数数列的情况下是等差数列,有没有可能其中的两项相等

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baxiannv posted 2022-5-28 00:07 from mobile |Read mode
如果一个数列在不是常数数列的情况下是等差数列,有没有可能其中的两项相等

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色k posted 2022-5-28 00:50 from mobile
这么简单的问题,尽量自己思考,别动不动就发帖问

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original poster baxiannv posted 2022-5-28 02:07 from mobile
色k 发表于 2022-5-28 00:50
这么简单的问题,尽量自己思考,别动不动就发帖问
真不会。。主要是忘了数列的概念 百度到深夜。。两项 项是啥 我都忘了。

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original poster baxiannv posted 2022-5-28 02:14 from mobile
色k 发表于 2022-5-28 00:50
这么简单的问题,尽量自己思考,别动不动就发帖问
3x,3x,3x,3x,3x算符合条件的数列吗

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色k posted 2022-5-28 02:16 from mobile
那就应该去看课本补基础,连概念都不清楚的话,这题告诉你答案,下一题还是不会

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original poster baxiannv posted 2022-5-28 02:20 from mobile
色k 发表于 2022-5-28 02:16
那就应该去看课本补基础,连概念都不清楚的话,这题告诉你答案,下一题还是不会 ...

x,x,x,x,x
y²,y²,y²,y²,y²
所有数都一样就行了吧
嗯 看了课本 说了把an当成未知数

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