1 . 计算:
=____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21e85c53ab11a7e8f43b79ac8799b9bf.png)
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2 . 等差数列{an}中,
,记数列
的前n项和为Sn,若
对任意的n∈N+恒成立,则正整数m的最小值为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81d718c3da8cde213f45ccca92bcc599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cf1da18d91f7c98086553d157d1a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a7a089fbeb0ea354cbb62dd5cf566a.png)
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3 . 锐角三角形ABC中,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1753d72942b116096579b05decd2b378.png)
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名校
4 . 已知
,试求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a31c4a4cedc3088d78a01ed4928a981.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d66c03d4ca06819a6ce7fc8ea6de0f0.png)
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2019-01-28更新
|
591次组卷
|
2卷引用:2018年全国高中数学联赛河南省预赛
5 . 若
,且
,则
的最小值是.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751e274e9107d780c39ba9c49d6daefb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23e0435a91ea3ddc6d033a01e2d35c1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87aeecc61522389daafe02283bb50670.png)
A.1 | B.![]() | C.![]() | D.2 |
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6 . 在
中,
所对的边分别为
.若
,
,
为
的内切圆上的动点,
为
到顶点
的距离为平方和,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c4fc13e84fabd2fd886c3a9a43eac9.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b23beb7fa35ed321584f95c7507b8b78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f5573b30734d65648f61c0a94c98de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6d39e8c6fc9149d6290c493a65bdc53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa171ccbdd48673be1713e67fb130e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c4fc13e84fabd2fd886c3a9a43eac9.png)
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7 . 已知双曲线
的离心率
,过其右焦点
且与
轴垂直的直线
交双曲线于
两点.求
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aabd7eea8154e23bfbe339e26b29d3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8d29e3afae3eaf9d60a82fab9f0d0af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b23a5326587f73957e7a887fbc1a2ea2.png)
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8 . 设函数
的定义域
,对任意
,
,都有
.且存在实数
,使得
.若数列
满足:
,求证:当
时,有
(i)
;
(ii)数列
为递增数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d200a7afe1e011713e14886a6887e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33bd24e647a626899a243a3f3984f90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67e9d063f31e28b30e052bfbf7002663.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdbb2855c612a3007d209fb2e02cc37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/245460a7f2be54fa45095316e71014a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0edbb326623182be50be565e94a60e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac69e6db1df13ed64756b4f391ae9fac.png)
(i)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423744758955a28ba23a32c169dbbcbe.png)
(ii)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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9 . 若
,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1372214137819172b4a42c54a51dd90d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb9089cd23a7f69a22abfe5d53b7e6aa.png)
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10 . 如图,
、
为
的切线,
、
为切点,
为线段
的中点,
为一条割线,直线
∥
,
与
、
、
分别交于
、
、
三点.证明:
(1)
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80672dda9430cb42b3136bcb1b67bbad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/128147bd4834566a78b4e9d2a3b2139c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e430f13f42cf2d44aa0f0e20b959684f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2e221d6e8c14d3ec9a328c8f9d176cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/128147bd4834566a78b4e9d2a3b2139c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8674febab68937f34399a1ff18d4707b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1be602a29cad9e1fb71072174e77eaf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6540f4a1c56cd4fe52203ce114129a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a829fdd8ec0f3b7ede883cf2c3e53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8b9ad2fcfff3dd546c5fdbedfe6238.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/045ac42a1ad2080467ada53208b85589.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/debaf6f1aef926f415f8d0ad0a4d32d4.png)
![](https://img.xkw.com/dksih/QBM/2018/12/4/2089396360224768/2089544311619584/STEM/ba6e48b6cc644f82b4c926fb8627dd95.png?resizew=152)
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