1.一个项数是偶数的等比数列,首项为1,又它的偶数项的和是奇数项的和的2倍,且中间两项的和为24,求此等比数列的项数2.{an}为等比数列,Sn为{an}的前n项和,S7=7,S15=75,Tn为数列{Sn/n}的前n项和,求Tn3.
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![1.一个项数是偶数的等比数列,首项为1,又它的偶数项的和是奇数项的和的2倍,且中间两项的和为24,求此等比数列的项数2.{an}为等比数列,Sn为{an}的前n项和,S7=7,S15=75,Tn为数列{Sn/n}的前n项和,求Tn3.](/uploads/image/z/2466034-34-4.jpg?t=1.%E4%B8%80%E4%B8%AA%E9%A1%B9%E6%95%B0%E6%98%AF%E5%81%B6%E6%95%B0%E7%9A%84%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%2C%E9%A6%96%E9%A1%B9%E4%B8%BA1%2C%E5%8F%88%E5%AE%83%E7%9A%84%E5%81%B6%E6%95%B0%E9%A1%B9%E7%9A%84%E5%92%8C%E6%98%AF%E5%A5%87%E6%95%B0%E9%A1%B9%E7%9A%84%E5%92%8C%E7%9A%842%E5%80%8D%2C%E4%B8%94%E4%B8%AD%E9%97%B4%E4%B8%A4%E9%A1%B9%E7%9A%84%E5%92%8C%E4%B8%BA24%2C%E6%B1%82%E6%AD%A4%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%E7%9A%84%E9%A1%B9%E6%95%B02.%7Ban%7D%E4%B8%BA%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%2CSn%E4%B8%BA%7Ban%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%2CS7%3D7%2CS15%3D75%2CTn%E4%B8%BA%E6%95%B0%E5%88%97%7BSn%2Fn%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%2C%E6%B1%82Tn3.)
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