1 . 已知点
在
所在的平面内,
,
为锐角,且
,
,
.当
取得最小值是,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5806dd26713a2b97a433fe873599b6f0.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87fd28b8b2bde9de5630a6106a6f762e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e800c6fa5152f2d250adf572550a1ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2eac116d422355a45a3a5d6b3384a6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0957e0145691743c6f03c6334cca44ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb00ca22375a7cd433c6d4c0539e072d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0751e04b75033fbabeff1bb3f6850635.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5806dd26713a2b97a433fe873599b6f0.png)
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2 . 已知等差数列{
}的首项为a
.设数列的前n项和为Sn,且对任意正整数n都有
.
(1)求数列{
}的通项公式及Sn;
(2)是否存在正整数n和k,使得
成等比数列?若存在,求出n和k的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88c8c4c2c1841dc214d272006a57d1d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e04d4139bce0da390d0134f92aa0f4cc.png)
(1)求数列{
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)是否存在正整数n和k,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0183f8b4052ab7d8449870388f26b619.png)
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2016-12-02更新
|
1503次组卷
|
2卷引用:2013-2014学年湖北武汉蔡甸区第二中学高一下六科竞赛理科数学试卷
3 . 已知数列
、![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
满足
(1)证明:对一切的
,有
.
(2)求数列
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8403d042c0394bcd82b5d0c2ab49e8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6febbec171eb91cef5fe044734b1f3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feacd516ccd94571dd1600a44b77ff9a.png)
(1)证明:对一切的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8403d042c0394bcd82b5d0c2ab49e8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc4291b6f4399a55d0248f630fc7a77e.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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2014高三·湖北·竞赛
名校
4 . 若
,且
,
,则
称为集合
的孤立元素那么,集合
的无孤立元素的四元子集有______ 个
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc020b0997a2f37b214718112b79d8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50c209f8710e0ce1e0c64042aa4d34a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2368f7373e7ae3bd33f58fcfc84c8460.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd92f9c7b1ec78816000707caf2adb7b.png)
您最近一年使用:0次
2018-12-05更新
|
167次组卷
|
3卷引用:2014年全国高中数学联赛湖北赛区预赛试题
5 . 已知二次函数
的图像过点
,且
是偶函数.
(1)求
的解析式.
(2)函数
的图像是否存在这样的点,其横坐标是正整数,纵坐标是一个完全平方数?如果存在,求出这样点的坐标;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83122767787250368fcedf1bd8e6ae56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8b3d5d84938175b9b850a1290128eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8138c4c94ac3223e8da5bae80c4c9ae.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
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2014高三·湖北·竞赛
6 . 在四面体
中,已知
,
,
面
则四面体
的外接球半径为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e4f0c1c9cca0555906d8a53e1a6803d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a494c4070276f17ba1410e1667d71ed1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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2007高三·湖北·竞赛
7 . 已知双曲线的中心在原点,焦点在坐标轴上,点
到其渐近线的距离为
.若过点P作斜率为
的直线交双曲线于
、
两点,交
轴于点
,且
是
与
的等比中项,则双曲线的半焦距为_______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/328aaba77106396d4ca644c8b7a352e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38be38165dc2307982fc57001a447c56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
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8 . 已知定义在R上的函数
满足
,且对任意实数x、y,恒有
①设数列
满足
.
(1)求数列
的通项公式;
(2)令
,
为数列
的前n项和.证明:
<1.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09843ac8bfc370e6198ad56fb2bcda02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98818bef6625dfef58baf9c0730cb6f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc02ba6805524fc3b552865ac9db1c2b.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0038314dfb078a2e0ac2ef375e96eee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
9 . 设平面点集
,
.若
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1763e8d751edb4cb5fe6874e3ba081e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e81e3ecc4052af71a63c9ef15671846.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/325dbfbc8356959f85771922170665ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73f8481c483bb605f505414fde3c6a8d.png)
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