1.设数列{An}是递增等差数列,前三项的和为12,前三项的积为48,则它的首项为__?2.等差数列{An}的前m项和为30,前2n项和为100,则它的前3m项和为__?3.已知两个等差数列{An}和{Bn}的前n项和分别为Sn和Tn,
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![1.设数列{An}是递增等差数列,前三项的和为12,前三项的积为48,则它的首项为__?2.等差数列{An}的前m项和为30,前2n项和为100,则它的前3m项和为__?3.已知两个等差数列{An}和{Bn}的前n项和分别为Sn和Tn,](/uploads/image/z/10189436-68-6.jpg?t=1.%E8%AE%BE%E6%95%B0%E5%88%97%7BAn%7D%E6%98%AF%E9%80%92%E5%A2%9E%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E5%89%8D%E4%B8%89%E9%A1%B9%E7%9A%84%E5%92%8C%E4%B8%BA12%2C%E5%89%8D%E4%B8%89%E9%A1%B9%E7%9A%84%E7%A7%AF%E4%B8%BA48%2C%E5%88%99%E5%AE%83%E7%9A%84%E9%A6%96%E9%A1%B9%E4%B8%BA__%3F2.%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%7BAn%7D%E7%9A%84%E5%89%8Dm%E9%A1%B9%E5%92%8C%E4%B8%BA30%2C%E5%89%8D2n%E9%A1%B9%E5%92%8C%E4%B8%BA100%2C%E5%88%99%E5%AE%83%E7%9A%84%E5%89%8D3m%E9%A1%B9%E5%92%8C%E4%B8%BA__%3F3.%E5%B7%B2%E7%9F%A5%E4%B8%A4%E4%B8%AA%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%7BAn%7D%E5%92%8C%7BBn%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E5%88%86%E5%88%AB%E4%B8%BASn%E5%92%8CTn%2C)
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