高二一道错位相减法的例题,Sn是前n项和.Sn=1·3+3·3^2+5·3^3+7·3^4………+(2n-1)·3^n ①3Sn=1·3^2+3·3^3+5·3^4+7·3^5……+(2n-1)·3^n+1 ② (请问前面的3是公比么)-2Sn=1·3+2·3^2+2·3^3+2·3^4……-(2n-1)·3^n
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![高二一道错位相减法的例题,Sn是前n项和.Sn=1·3+3·3^2+5·3^3+7·3^4………+(2n-1)·3^n ①3Sn=1·3^2+3·3^3+5·3^4+7·3^5……+(2n-1)·3^n+1 ② (请问前面的3是公比么)-2Sn=1·3+2·3^2+2·3^3+2·3^4……-(2n-1)·3^n](/uploads/image/z/4661450-26-0.jpg?t=%E9%AB%98%E4%BA%8C%E4%B8%80%E9%81%93%E9%94%99%E4%BD%8D%E7%9B%B8%E5%87%8F%E6%B3%95%E7%9A%84%E4%BE%8B%E9%A2%98%2CSn%E6%98%AF%E5%89%8Dn%E9%A1%B9%E5%92%8C.Sn%3D1%C2%B73%2B3%C2%B73%5E2%2B5%C2%B73%5E3%2B7%C2%B73%5E4%E2%80%A6%E2%80%A6%E2%80%A6%2B%EF%BC%882n-1%29%C2%B73%5En+%E2%91%A03Sn%3D1%C2%B73%5E2%2B3%C2%B73%5E3%2B5%C2%B73%5E4%2B7%C2%B73%5E5%E2%80%A6%E2%80%A6%2B%282n-1%EF%BC%89%C2%B73%5En%2B1+%E2%91%A1+%EF%BC%88%E8%AF%B7%E9%97%AE%E5%89%8D%E9%9D%A2%E7%9A%843%E6%98%AF%E5%85%AC%E6%AF%94%E4%B9%88%EF%BC%89-2Sn%3D1%C2%B73%2B2%C2%B73%5E2%2B2%C2%B73%5E3%2B2%C2%B73%5E4%E2%80%A6%E2%80%A6-%282n-1%EF%BC%89%C2%B73%5En)
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