【简答题】(14分)若S 是公差不为0的等差数列 的前n项和,且 成等比数列。 (1)求等比数列 的公比; (2)若 ,求 的通项公式; (3)设 , 是数列 的前n项和,求使得 对所有 都成立的最小m。
【简答题】设各项均为正数的数列{a n }的前n项和为S n ,已知2a 2 =a 1 +a 3 ,数列{ }是公差为d的等差数列。 (I)求数列{a n }的通项公式(用n,d表示); (Ⅱ)设c为实数,对满足m+n=3k且m≠n的任意m,n,k,不等式S m +S n >cS k 都成立,求证:c的最大值为 。
【单选题】success of Zhu Zhiwen’s singing has been great honor to his hometown.
【单选题】The success of Zhu Zhiwen didn't merely good luck. [ ]
【单选题】Zhu Zhiwen's never been to Hongkong, ______? [ ]
【简答题】已知数列 的前n项和为 ,对任意 ,点 都在函数 的图像上。 (1)求数列 的通项公式; (2)设 ,且数列 是等差数列,求非零常数p的值; (3)设 , 是数列 的前n项和,求使得 对所 有都成立的最小m。
【单选题】Zhu Zhiwen,Overcoat Brother, came here to______ us in singing for the National Day the other day.
【简答题】success of Zhu Zhiwen’s singing has been great honour to his hometown. A.The,a B.The;an C.不填,the D.The,不填