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专题11与等比数列相关的结论一、结论已知等比数列,公比为,前项和为.(1)().(2)若,则();反之,不一定成立.(3),,,成等比数列().(4)公比时,,,,成... 2026-07-191983240.03 KB4页162
专题11与等比数列相关的结论一、结论已知等比数列,公比为,前项和为.(1)().(2)若,则();反之,不一定成立.(3),,,成等比数列().(4)公比时,,,,成... 2026-07-19311406.47 KB7页12
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