1.若等比数列an的前n项和为2,紧接着后面的2n项和为12,再紧接着其后的3n项和为?2.已知两个数列an,bn的前n项和味An,Bn,若An/Bn=(2n-3)/(4n-3),则Lim an/bn=?3.设Sn是等差数列的前面N项和。已知a3=12.a12>0
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![1.若等比数列an的前n项和为2,紧接着后面的2n项和为12,再紧接着其后的3n项和为?2.已知两个数列an,bn的前n项和味An,Bn,若An/Bn=(2n-3)/(4n-3),则Lim an/bn=?3.设Sn是等差数列的前面N项和。已知a3=12.a12>0](/uploads/image/z/1159346-2-6.jpg?t=1.%E8%8B%A5%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97an%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BA2%2C%E7%B4%A7%E6%8E%A5%E7%9D%80%E5%90%8E%E9%9D%A2%E7%9A%842n%E9%A1%B9%E5%92%8C%E4%B8%BA12%2C%E5%86%8D%E7%B4%A7%E6%8E%A5%E7%9D%80%E5%85%B6%E5%90%8E%E7%9A%843n%E9%A1%B9%E5%92%8C%E4%B8%BA%EF%BC%9F2.%E5%B7%B2%E7%9F%A5%E4%B8%A4%E4%B8%AA%E6%95%B0%E5%88%97an%EF%BC%8Cbn%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E5%91%B3An%2CBn%2C%E8%8B%A5An%2FBn%3D%282n-3%29%2F%284n-3%29%2C%E5%88%99Lim+an%2Fbn%3D%3F3.%E8%AE%BESn%E6%98%AF%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%E7%9A%84%E5%89%8D%E9%9D%A2N%E9%A1%B9%E5%92%8C%E3%80%82%E5%B7%B2%E7%9F%A5a3%3D12.a12%EF%BC%9E0)
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