1 . 如图,
、
分别是△ABC、△ACD的重心,
的外接圆与直线BD相交于点P,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc71c35d851ff74646c728756b24efb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/951d73cefe3fed1c5e70210ce71ae2fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5035afd29380c8912a02ac79a7db19b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a69a73f2044f45086374c2e068b548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3269cf61861183004455d640aac8ccf0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/ada6f890-0c6f-474f-a6a8-d92f18e4566a.jpg?resizew=193)
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解题方法
2 . 已知f(x)是定义在R上的函数,满足
.
(1)若
,求
;
(2)证明:函数f(x)的周期是2;
(3)当
时,f(x)=2x,求f(x)在
时的解析式,并写出f(x)在
时的解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7b94f154fad04efe8c4af84831ee43b.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa078bf063c53e4cd50579363c8c7927.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17a5c34098f0c1729c163875e63ce3e7.png)
(2)证明:函数f(x)的周期是2;
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04614d0fac9cde995374a43d4323b723.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89a1891ad6476d0f35364b27d8f5241a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1b7a52fd39fb29c561b531e933ac001.png)
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解题方法
3 . 已知幂函数y=f(x)的图象过点
.
(1)求函数f(x)的解析式,利用定义法证明函数的单调性;
(2)求满足f(1+a)>f(3-a)的实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e501efaf72113fc8ee3d495004fa980.png)
(1)求函数f(x)的解析式,利用定义法证明函数的单调性;
(2)求满足f(1+a)>f(3-a)的实数a的取值范围.
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4 . 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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5 . 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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6 . 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)
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2020-05-12更新
|
1339次组卷
|
4卷引用:2019年全国高中数学联赛福建省预赛
7 . 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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8 . 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
9 . 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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