1 . 设
、
、
是方程
的三个根,
且
.
⑴求
的整数部分;
⑵求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21db4e349477acece26642653c1876a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95f5ae6592d62f1efb53e37647407722.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c799b0a577c0c25274bc0554ea2753ea.png)
⑴求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
⑵求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe9c48c9f8e12cfb0ac44e7f4e919e1.png)
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2 . 设
,
,正实数数列
满足
,且当
时
.求证: ⑴当
时,
; ⑵
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1465145d6bc8543d5c544dd99613970d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27008dcb6262187804a14cab9302a876.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c10652cbb829968425b5d43b3e19eea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a347b7b06cf3541256a952adfe637750.png)
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3 . 如图,
、
是双曲线
的两个焦点,一条直线与双曲线的右支相切,且分别交两条渐近线于A、B.又设O为坐标原点,求证: (1)
; ⑵
、
、A、B四点在同一个圆上.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/565bc68d208cd5e0c90a32851faf3814.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a05d4d803a85dc1059912895954551b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://img.xkw.com/dksih/QBM/2019/1/28/2128340345315328/2129028866695168/STEM/cd48519e-7460-4653-91b5-2403e14064a5.png)
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4 . 设
,
,
.
证明:(1)存在常数
,使得对任意正整数
,有
.
(2)对任意正整数
,有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/329785900390130a04a57d0b55aaa569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23e80d92604d555e5527e2940dbab30d.png)
证明:(1)存在常数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75aed2b995e34438a29a4170cf535914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a789bc44e657fb9df0dc9071407a596e.png)
(2)对任意正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84310b5773fd68151cbde54e1cfb46de.png)
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5 . .设数列
定义为
证明:
(1)当
时,
;
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2543c7c9a423923b80e8992386dc0901.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10e468312d09c6563c9094b710a35a65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7570de15dc9f0ce429965d285074474.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ebf13e7dcac5fdc3042ebae642d29f5.png)
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2005高三·天津·竞赛
6 . 已知椭圆
,其长轴为
,
是椭圆上不同于点
、
的一个动点,直线
、
分别与同一条准线
交于
、
两点.试证明:以线段
为直径的圆必经过椭圆外的一个定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a696a182fff038a86b2bbe8ca099442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a696a182fff038a86b2bbe8ca099442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/800c5e266b4ad8462a46970f0a232d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b104090ea2ac34be58a76a4e0e95cb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/123a6eaa56d0b9bd254c6d1361d9114c.png)
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7 . 设
,
.证明:
(1)
,并说明等号成立的条件;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34d2fc03d083218f9cf386fbcbb8a418.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c191d8e799cc95ba94265065358071c7.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7ef4038f7ce2cd1ac8b4bd9bd59f937.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e24d8650153d6030223fc1707c122484.png)
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2012高三·天津·竞赛
8 . 已知双曲线的两个焦点坐标分别为
和
,双曲线的一条切线与
轴交于
,且斜率为2.
(1)求双曲线的方程;
(2)若切线与双曲线的切点为
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/813f9a2814013e2407b5b1c216159359.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16fd15503ee692f8286b0312f7c6f0cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46b9768c2c8d0dbdc451c379fa857c11.png)
(1)求双曲线的方程;
(2)若切线与双曲线的切点为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/524d8d29bd10a0daec1da12dc7684316.png)
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9 . 设a为实数,两条抛物线
与
有四个交点
(1)求a的取值范围;
(2)证明这四个交点共圆,并求该圆圆心的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/263c2df4f4312b38903d48189b3bef53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64d21130714686d23efad3a9ddae43a7.png)
(1)求a的取值范围;
(2)证明这四个交点共圆,并求该圆圆心的坐标.
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