高三 数学 一道简单选择题等比数列前n项和为54,前2n项和为60,则前3n项和为()A.66 B.64 C.66X2÷3 D.60X2÷3我考的是全国卷,基本上数列都会作为一道选择题考查,不难做,不过,如果一下记不住公式就
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![高三 数学 一道简单选择题等比数列前n项和为54,前2n项和为60,则前3n项和为()A.66 B.64 C.66X2÷3 D.60X2÷3我考的是全国卷,基本上数列都会作为一道选择题考查,不难做,不过,如果一下记不住公式就](/uploads/image/z/9293972-68-2.jpg?t=%E9%AB%98%E4%B8%89+%E6%95%B0%E5%AD%A6+%E4%B8%80%E9%81%93%E7%AE%80%E5%8D%95%E9%80%89%E6%8B%A9%E9%A2%98%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BA54%2C%E5%89%8D2n%E9%A1%B9%E5%92%8C%E4%B8%BA60%2C%E5%88%99%E5%89%8D3n%E9%A1%B9%E5%92%8C%E4%B8%BA%EF%BC%88%EF%BC%89A.66+B.64+C.66X2%C3%B73+D.60X2%C3%B73%E6%88%91%E8%80%83%E7%9A%84%E6%98%AF%E5%85%A8%E5%9B%BD%E5%8D%B7%2C%E5%9F%BA%E6%9C%AC%E4%B8%8A%E6%95%B0%E5%88%97%E9%83%BD%E4%BC%9A%E4%BD%9C%E4%B8%BA%E4%B8%80%E9%81%93%E9%80%89%E6%8B%A9%E9%A2%98%E8%80%83%E6%9F%A5%2C%E4%B8%8D%E9%9A%BE%E5%81%9A%2C%E4%B8%8D%E8%BF%87%2C%E5%A6%82%E6%9E%9C%E4%B8%80%E4%B8%8B%E8%AE%B0%E4%B8%8D%E4%BD%8F%E5%85%AC%E5%BC%8F%E5%B0%B1)
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