1 . 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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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 . 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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4 . 已知正三棱锥
的体积为
,侧面
与底面
所成二面角的平面角为
,D为线段AB上一点,
,E为线段AC上一点,
,F为线段PC的中点,平面DEF与线段PB交于点G.求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/604d037b88148502a5608e0285c76f35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84ed5fe95eeed65ec7f7baa832a68979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3e0431cc99d41d62470fd7972bf288f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
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5 . 设
,令
,
,证明:对任何正整数n,有
.①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1510639120a1883e66f13794a9df9179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e57bd57ae11e8ba6d5f329814ea6ae38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97909dd7ffe8c3941798129c9ab81a31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abece478d06e6f32167bbce0ac3ef30e.png)
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6 . 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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7 . 设
.证明:对任意的
,有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28d73a960601c6c230915916f77fa12f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098cadc08395d87ca241558e02933f73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66c860cd97f429172640e48cff703a37.png)
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8 . 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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9 . 已知正
内接于抛物线
,
的重心
落在双曲线
上.求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d255a656d442bd0046aefa19b9e30bc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377a2333ff8c63cbdb20b882d6d5a7ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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