已知
是递增的等差数列,
是方程
的两根.
(1)求数列
的通项公式;
(2)求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0158862238e250d2a2598b7d4ecd148.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37b0b55c3297ce66c96d1559d76971f4.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fbe113b7c2cc1b464e86bdfa3a6fe2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
更新时间:2016-12-04 19:11:35
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解答题-问答题
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名校
【推荐1】已知等差数列
的前n项和为
,
,
.
(1)求
的通项公式;
(2)求使
成立的n的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求使
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【推荐2】在数列
中,
.其前
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(1)求
的通项公式;
(2)设
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fdb50cacd8eb999c9398a3ec378b416.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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解答题-问答题
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【推荐1】已知等差数列
的前
项和为
,
,且
,
,
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(Ⅰ)求数列
的通项公式;
(Ⅱ)若
,
是数列
的前
项和,求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2fcd86b9ed6819116a261629f96fae1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc17ca3ab612ea9cf6cfa1eea53cb1eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3547886abee1a603e275c6e808fb5b79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1a05feb0cc8f37effea9e72726ced58.png)
(Ⅰ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f994ce6b6d24932258d6a48c5c666e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd85b79372dc6e596d465f738c3c300.png)
您最近一年使用:0次
【推荐2】已知等差数列
的前n项和为
,且
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(1)求
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(2)若
,求数列
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a16a21e64ee3172707d9933bf9d0d810.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e35b6e874e4eecad39c9cf469fa72b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
【推荐1】已知等比数列
的各项均为正数,且
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(2)已知
,求数列
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82effa9b75819b67faca9b4069f9f0fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/157fc73999f07d08e7814c83f8aa4783.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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(2)已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
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解答题-问答题
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较易
(0.85)
【推荐2】本题满分12分)已知数列
,其中
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(1)求![](https://img.xkw.com/dksih/QBM/2010/8/11/1569811850477568/1569811855572992/STEM/7b92a2994f1444e48551e2453c5996ee.png)
(2)求数列
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(3)设数列
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.求
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![](https://img.xkw.com/dksih/QBM/2010/8/11/1569811850477568/1569811855572992/STEM/af16364577e646b286deb7f64a3e2a98.png)
![](https://img.xkw.com/dksih/QBM/2010/8/11/1569811850477568/1569811855572992/STEM/e53d459faca64fd99d3fe2420f64131b.png)
![](https://img.xkw.com/dksih/QBM/2010/8/11/1569811850477568/1569811855572992/STEM/f2fd735d3f6b4b97a5cbbe7e4c6ff501.png)
(1)求
![](https://img.xkw.com/dksih/QBM/2010/8/11/1569811850477568/1569811855572992/STEM/7b92a2994f1444e48551e2453c5996ee.png)
(2)求数列
![](https://img.xkw.com/dksih/QBM/2010/8/11/1569811850477568/1569811855572992/STEM/af16364577e646b286deb7f64a3e2a98.png)
(3)设数列
![](https://img.xkw.com/dksih/QBM/2010/8/11/1569811850477568/1569811855572992/STEM/fa952913060b450bbbf58caf0813cc48.png)
![](https://img.xkw.com/dksih/QBM/2010/8/11/1569811850477568/1569811855572992/STEM/176c000753324f3a8014779c1e24d5ed.png)
![](https://img.xkw.com/dksih/QBM/2010/8/11/1569811850477568/1569811855572992/STEM/e316962bc96d4af69fd008bd36fe0b1e.png)
![](https://img.xkw.com/dksih/QBM/2010/8/11/1569811850477568/1569811855572992/STEM/12a8a80b8ea040349f6c4f181587f23b.png)
您最近一年使用:0次