1 . 如图,在钝角
中,
为钝角.设
的外角平分线与
过B和过C的高线分别交于点E,F,点M在线段EC上使得
,点N在线段BF上,使得
.证明:E,F,M,N四点共圆.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f480c60b88b546cb15d3b5622e212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d21fa3492cd1ac2b3f9278d3fe4cd4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d21fa3492cd1ac2b3f9278d3fe4cd4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f480c60b88b546cb15d3b5622e212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cd09bf3d43769b015a0a8d5b34cdefe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37595daefab7761a896f29f785d253d1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/bc6bb557-dd54-4bd6-8e9a-982625129d7d.png?resizew=217)
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解题方法
2 . 设函数
.
(1)证明:存在唯一的函数
,使得
;
(2)求所有的非负实数
使得
;
(3)
,
(i)证明:关于
的方程
与
都有唯一实根;
(ii)记
分别为方程
,
的实根,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041fc0e0ff542027634491e686a510b6.png)
(1)证明:存在唯一的函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ee09653f053eccbba4b85fbf97c3e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aca8208f53be6a7033b4fd2a11c7964.png)
(2)求所有的非负实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f8bfb563f79688d136e0cb958b5153c.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb1523685c2d0a9ef21660908378ac90.png)
(i)证明:关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/713c59f274e9146b6d85375435315521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3a4cb45ca6e42ced4a5c4026e2290f8.png)
(ii)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd8ca3aa2d1ba52e82613d0d65d800e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/713c59f274e9146b6d85375435315521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3a4cb45ca6e42ced4a5c4026e2290f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3c414bc882fb3c5e364582886c3325c.png)
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3 . 如图,以
为直径的圆上有C、D两点,
、
两点的中点为E、F,直线
与直线
、
分别交于G、H,求证:以
为直径的圆和以
为直径的圆有一交点在
上.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/d496b902-6c03-41d8-8ae3-dd56cb0c8dd2.png?resizew=224)
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解题方法
4 . 如图,圆台上底面圆
半径为1,下底面圆
半径为
为圆台下底面的一条直径,圆
上点
满足
是圆台上底面的一条半径,点
在平面
的同侧,且
.
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966573292437504/2968469579579392/STEM/259d8c83-f08f-4c4b-9aef-f05e35c1d544.png?resizew=163)
(1)证明:平面
平面
;
(2)若圆台的高为2,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/838a424964c2e96bb8e8dfc27a062b1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d46827c30d924e9a7fc8d627515e4c5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfaa712e64750e3e2843bae68ebad6d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3da630440d6d416f19ee22c8431c882.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b658c6aaa010f64b703a97b3fc7db187.png)
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966573292437504/2968469579579392/STEM/259d8c83-f08f-4c4b-9aef-f05e35c1d544.png?resizew=163)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)若圆台的高为2,求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cee51552e3c12bc27cf8ab1777bf191.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
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2022-04-29更新
|
2925次组卷
|
9卷引用:湖南省湘西州吉首市2022年第一届中小学生教师解题大赛数学试题
5 . 求证:存在非零复数c与实数d,使得对于一切模长为1的复数
均有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3185a496b769c519c56b007527aaf62b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cec18bd06c3d0d1a5a1be8b4627b5c7.png)
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6 . 设n是正整数,
是n的全部正因数.定义
,已知
是2的幂次,求证:n没有1之外的平方因数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8acb24ab5f56bcdd89da8643b91898a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf47dcfd0a568183fa3b557d9423d74e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d4fc8faefb26b233d4aa9dbef043aae.png)
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7 . 若数列
,求证:存在无穷多个正整数n,使得
,并确定是否存在无穷多个正整数n使得
?(这里
表示不超过x的最大整数)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3f8dec8428b043470e96c94f99896a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2798e1dcab1f7f0fe3b8a94b3cd6a88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1254070260067f8bf2fec39a7d0c8f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
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8 . 设n是正整数,我们说集合
的一个排列
具有性质P,是指在
当中至少有一个i,使得
.求证:对于任何n,具有性质P的排列比不具有性质P的排列的个数多.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27b73ddd744f2f715aad49f52da0aea6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/501c3dd561143eae443ca3bb3d5caf53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da1428d10c6854c6be55b791fe98fe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/968b1b4abe8c4b4daa25d174520ddc67.png)
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9 . 设
为n个正整数,并且满足
,令
,并记
.求证:对于任意
,必存在正整数u、v,使得
,等于A或
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9304e71a623c4412188a800046a970d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f31fb58fdf7b1ca2b5678208adb645.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d705531a8bf4c29db4eb3babc7dd456e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/198b98fe39fc6cad96db9217d6bd5ae5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/570ae28768c5542147c0830214f1b4e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e50c6c7f5ebd4dadd5dd333953fd36c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53467a21f223db674eb9497021ea9c5c.png)
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解题方法
10 . 求证:对任意的
,都有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209559aca6bf32705588b6a40e0b7320.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129dcd8a7c5e024790ea5f08712b3ce2.png)
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