2004高三·吉林·竞赛
1 . 设
,且
.求证:
.分析:为了证明结论中的不等式,可以先由已知条件,运用均值不等式证明以下的3个不等式
,
,
(其中
为常数).再将上述3个不等式相加即可得证.则分析过程中常数
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/876060b33593f5c1981e4c300506d882.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56667aabbe787eb1c3189d487d203e22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f564a7ca42b9fc2f0a21436046e06b89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ed65fb17fc6be31a10ae891c3485ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c36cb0aa454c04efb1c44adb577d5353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf421508727cc6ec73edcde5e1eb6e77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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2 . 已知椭圆
的左右焦点分别为F1、F2,右顶点为A,P为椭圆C上任意一点.已知
的最大值为3,最小值为2.
(1)求椭圆C的方程;
(2)若直线l:y=kx+m与椭圆C相交于M、N两点(M、N不是左右顶点),且以MN为直径的圆过点A.求证:直线l过定点,并求出该定点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851a5d6ec23256f9b4a9e98aa92945fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fddc29037a26719130e6548f25a2500a.png)
(1)求椭圆C的方程;
(2)若直线l:y=kx+m与椭圆C相交于M、N两点(M、N不是左右顶点),且以MN为直径的圆过点A.求证:直线l过定点,并求出该定点的坐标.
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2009高三·吉林·竞赛
3 . 若
、
、
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44d15037419d9e35c44d803c4fa3cea7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0f6095177be4f01c29311b0a01e6cde.png)
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4 . 一个由空间中的点组成的集合
满足性质:
中任意两点之间的距离互不相同.假设
中的点的坐标
都是整数,并且
、
、
.证明:集合
的元素个数小于
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b525d8c768efd801ab58bc4c0da9221e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b38801a4ec7a47cfd6cea29f742248b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efd7417b43749d2062dda327e4ceb2cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5bc579800ed2f37f89cc21404447181.png)
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5 . 设函数
(a、b为实常数).已知不等式
对任意的实数x均成立,定义数列
和
为:
,
,
,数列
的前n项的和记为
,其前n项的乘积记为
.证明:
(1)
,且
;
(2)对任意的正整数n,
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80027540415bd2b98c9be19e21b5f8d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8f48aa05da897001b1441df2cd394ef.png)
![](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/0ea8d0e50065114b05ef2dc1ea1129cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421111d35dfd84912601cd15d4cdb614.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b3309774e41aa1d486d05861ef9438f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a4a7a8909947604f0a3e850004b4138.png)
(2)对任意的正整数n,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad23429bdf441f532cfbf8c2948ba75a.png)
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6 . 证明:任给7个实数,其中必存在两个实数
、
满足
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ac02e1c83fe3454f1600a2c620a07a.png)
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2006高三·吉林·竞赛
7 . 求证:
,其中
为任意正整数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c68258f0f30b57fa841c8c351ea0d93f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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2013高三·吉林·竞赛
8 . 已知
分别为
三个内角
的对边,且
.
(1)证明:
成等差数列;
(2)若
求
的最大值,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f5573b30734d65648f61c0a94c98de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b23beb7fa35ed321584f95c7507b8b78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4b8e0866e5f704c6ecd84904a44f21.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b23beb7fa35ed321584f95c7507b8b78.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f30f35cdf116691c3fa19f0c8917b808.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/451be539a00c5a0fa9e00fc9bf4c39fd.png)
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9 . 已知椭圆
,直线
与椭圆
交于点
、
,且
.判断直线
与
的位置关系,并给出证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f0748ec234ec293d31b395d0549016e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.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/ae5a64bcb77f5f64e4af6930c249a270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4abd405a5d38d011c3f8c62ea4940b18.png)
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