已知数列an的前n项和为sn,且a1+2a2+3a3 答对直接高分
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![已知数列an的前n项和为sn,且a1+2a2+3a3 答对直接高分](/uploads/image/z/1071850-58-0.jpg?t=%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97an%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BAsn%2C%E4%B8%94a1%2B2a2%2B3a3+%E7%AD%94%E5%AF%B9%E7%9B%B4%E6%8E%A5%E9%AB%98%E5%88%86)
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