已知等差数列{an}满足:a3=7,a5+a7=26.{an}的前n项和Sn.求a4及sn

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已知等差数列{an}满足:a3=7,a5+a7=26.{an}的前n项和Sn.求a4及sn

已知等差数列{an}满足:a3=7,a5+a7=26.{an}的前n项和Sn.求a4及sn已知等差数列{an}满足:a3=7,a5+a7=26.{an}的前n项和Sn.求a4及sn已知等差数列{an}

已知等差数列{an}满足a3=7,a5+a7=26{an}的前n项和为Sn求a4及Sn

已知等差数列{an}满足a3=7,a5+a7=26{an}的前n项和为Sn求a4及Sn已知等差数列{an}满足a3=7,a5+a7=26{an}的前n项和为Sn求a4及Sn已知等差数列{an}满足a3

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已知等差数列{an},a3=7.a5+a7=26.{an}的前n项和为Sn.1.求a4及Sn.已知等差数列{an},a3=7.a5+a7=26.{an}的前n项和为Sn.1.求a4及Sn.已知等差数列

已知等差数列{an}满足:a3=7,a5+a7=26,{an}前n项和为sn,求an及sn

已知等差数列{an}满足:a3=7,a5+a7=26,{an}前n项和为sn,求an及sn已知等差数列{an}满足:a3=7,a5+a7=26,{an}前n项和为sn,求an及sn已知等差数列{an}

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