1 . 已知
.
(1)当
时,不等式
恒成立,求m的取值范围;
(2)求证:当
时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/331d70266454df40256268b19b055a88.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/044fa22986cfe763ff757f5d3e0e29e2.png)
(2)求证:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e44387f425a6e9528e3b6e902848b65d.png)
您最近一年使用:0次
2020-05-12更新
|
1341次组卷
|
4卷引用:2019年全国高中数学联赛福建省预赛
2 . 已知实数
满足
,且
.证明:存在整数
,使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619acd7f11cc83e79f8a0b4bded6366e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9a45404b51ce8cfc4377e5aeddf4eb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d32671db64484de8db437478097733d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4693365ce682a31111d8882174e9b49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da1fe9b072e5cbd56c321cd132c84c3.png)
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3 . 已知F为椭圆
的右焦点,点P为直线x=4上的动点,过点P作椭圆C的切线PA、PB,A、B为切点.
(1)求证:A、F、B三点共线;
(2)求△PAB面积的最小值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/279cefeb5c389a37a71e5fd3925f5954.png)
(1)求证:A、F、B三点共线;
(2)求△PAB面积的最小值
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4 . 如图,O、H分别为锐角△ABC的外心垂心,AD⊥BC于D,G为AH的中点点K在线段GH上,且满足GK=HD,连结KO并延长交AB于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/bb0b5f94-e86f-455f-afe0-744ae279bf26.png?resizew=177)
(1) 证明:
;
(2) 证明:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/bb0b5f94-e86f-455f-afe0-744ae279bf26.png?resizew=177)
(1) 证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c56961a6826101fcf0141caf725a1.png)
(2) 证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9c916bcf2d632466bed777e36688341.png)
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5 . 设集合A、B都是由正整数组成的集合,
,并且集合A满足如下条件:若x、y、u、v∈A, x+y=u+v,则
.令
.求证:
(
表示集合X中元素的个数).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e87935289c6a384c741604fb5b2cc4ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c789c9d55e4867dc8044a2b8f4a1e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6903eda04fd5840f9a7850233d65702a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23819ffd666708085210523d3a49604.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/932d66aada908a7476b68752d1f29eec.png)
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2005高三·福建·竞赛
6 . 如图,已知
的内心为I,AC≠BC,内切圆与边AB、BC、CA分别相切于点D、E、F、S= CI∩EF,联结CD与内切圆的另一个交点为M,过点M的切线交AB的延长线于点G.求证:
![](https://img.xkw.com/dksih/QBM/2018/12/14/2096465791262720/2097449099272192/STEM/c6e5d3bd-0edb-49cf-93db-6fcd92a4f34b.png)
(1)
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://img.xkw.com/dksih/QBM/2018/12/14/2096465791262720/2097449099272192/STEM/c6e5d3bd-0edb-49cf-93db-6fcd92a4f34b.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78ca771f8501c94e2be31b6e283865f9.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c2e4721416145b2790782d40e341140.png)
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2009高三·福建·竞赛
7 . 已知正实数
、
、
满足
.求证:
(1)
;
(2)
.
![](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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8720d2743b33079a807740dc0d761ad.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cba7fe47fa257919e1380979eafb55a.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76df8ea77f3cde8c86b2f475f5a54794.png)
您最近一年使用:0次
2009高三·福建·竞赛
8 . 如图,
与线段
切于点
,且与以
为直径的半圆切于点
,
于点
,
与以
为直径的半圆交于点
,且与
切于点
,联结
、
.求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/899a45d3-9f0b-4415-bc3d-2a633a763d4e.png?resizew=180)
(1)
、
、
三点共线;
(2)
;
(3)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/899a45d3-9f0b-4415-bc3d-2a633a763d4e.png?resizew=180)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9751ea1d1d9447230ac4d47839c138b8.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/877957d8abafe3ed07742759fc33c93e.png)
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9 . 已知
(
为自然对数的底数).证明:
(1)
恒成立;
(2)
对一切正整数
均成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd5a5dae0430248ab1f5b2ec3418977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9c599e8d420006448905acec2b8234.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91979f56279f46f2d0c910f3dd7b35a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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2010高三·福建·竞赛
名校
10 . 如图,在锐角△ABC中,AB=AC,∠ACB的平分线与AB交于点D,过△ABC的外心O作CD的垂线与AC交于点E,过E作AB的平行线与CD交于点F.证明:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/36a36766-c461-4229-9aaf-0adcf18c23c8.png?resizew=109)
(1)C、E、0、F四点共圆;
(2)A、0、F三点共线;
(3)EA=EF.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/36a36766-c461-4229-9aaf-0adcf18c23c8.png?resizew=109)
(1)C、E、0、F四点共圆;
(2)A、0、F三点共线;
(3)EA=EF.
您最近一年使用:0次