等差数列习题【求解析】1、在等差数列{a(n)}中,已知a(1)=1/3,a(2)+a(5)=4,a(n)=33,求n.【答案50】2、已知数列a,x,b,2x依次成等差数列,则b比a=【答案3比1】3、等差数列{7n+105 }中在区间[300,500]之
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![等差数列习题【求解析】1、在等差数列{a(n)}中,已知a(1)=1/3,a(2)+a(5)=4,a(n)=33,求n.【答案50】2、已知数列a,x,b,2x依次成等差数列,则b比a=【答案3比1】3、等差数列{7n+105 }中在区间[300,500]之](/uploads/image/z/400224-48-4.jpg?t=%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%E4%B9%A0%E9%A2%98%E3%80%90%E6%B1%82%E8%A7%A3%E6%9E%90%E3%80%911%E3%80%81%E5%9C%A8%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%7Ba%28n%29%7D%E4%B8%AD%2C%E5%B7%B2%E7%9F%A5a%281%29%3D1%2F3%2Ca%EF%BC%882%EF%BC%89%2Ba%EF%BC%885%EF%BC%89%3D4%2Ca%EF%BC%88n%EF%BC%89%3D33%2C%E6%B1%82n.%E3%80%90%E7%AD%94%E6%A1%8850%E3%80%912%E3%80%81%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97a%2Cx%2Cb%2C2x%E4%BE%9D%E6%AC%A1%E6%88%90%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E5%88%99b%E6%AF%94a%3D%E3%80%90%E7%AD%94%E6%A1%883%E6%AF%941%E3%80%913%E3%80%81%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%7B7n%2B105+%7D%E4%B8%AD%E5%9C%A8%E5%8C%BA%E9%97%B4%5B300%2C500%5D%E4%B9%8B)
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