1.S=a^n+a^(n-1)b+a^(n-2)b^2+……+ab^(n-1)+b^n(n∈N*,ab≠0)2.已知数列{An}的通项公式为An={-6n+5(n为奇数),求该数列的前n项和Sn{2^n(n为偶数)
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![1.S=a^n+a^(n-1)b+a^(n-2)b^2+……+ab^(n-1)+b^n(n∈N*,ab≠0)2.已知数列{An}的通项公式为An={-6n+5(n为奇数),求该数列的前n项和Sn{2^n(n为偶数)](/uploads/image/z/223666-34-6.jpg?t=1.S%3Da%5En%2Ba%5E%28n-1%29b%2Ba%5E%28n-2%29b%5E2%2B%E2%80%A6%E2%80%A6%2Bab%5E%28n-1%29%2Bb%5En%EF%BC%88n%E2%88%88N%2A%2Cab%E2%89%A00%EF%BC%892.%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97%EF%BD%9BAn%7D%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F%E4%B8%BAAn%3D%7B-6n%2B5%28n%E4%B8%BA%E5%A5%87%E6%95%B0%EF%BC%89%2C%E6%B1%82%E8%AF%A5%E6%95%B0%E5%88%97%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8CSn%EF%BD%9B2%5En%28n%E4%B8%BA%E5%81%B6%E6%95%B0%EF%BC%89)
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