1 . 如图,圆内接四边形ABCD中,自AD的中点M,作
,
为垂足.证明:MN过线段EF的中点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c54ec68a9e29623bbcb5c4f0b0b5fee3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a69a834c69bd87566ec3087903bc573.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/07aa1a05-2e6b-4549-9360-b62f841171e7.png?resizew=178)
您最近一年使用:0次
2 . 求解函数
的最大最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e1e7c131ba84b892f025d8d8fc8ea4f.png)
您最近一年使用:0次
3 . 设直线
与椭圆
交于点M、N,且OM⊥ON(O为原点).若
,求椭圆的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9332a452cefed95e41d032f571621e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de3871284fa55f0ec4ae4761e0c82787.png)
您最近一年使用:0次
4 . 已知在正整数n的各位数字中,共含有
个1,
个2,⋯,
个n.证明:
并确定使等号成立的条件.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d04a8b7a7595251251b8e0b7e665e8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5453ec6a9e8b96357c888ea863ddcf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/649fad26925be63140de835a44b78ed3.png)
您最近一年使用:0次
2018-12-07更新
|
370次组卷
|
3卷引用:2016年全国高中数学联赛山西赛区预赛试题
5 . 在△ABC中,M、N分别为边AB、AC上的点,且满足
.证明:线段MN经过△ABC的重心.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a376d59d4f089411199d3ae3f14969b3.png)
您最近一年使用:0次
6 . 如图,
、
、
为
的外接圆
上的点,满足
,P为
上的任意一点.若直线
与BC、
与AC、
与AB分别交于点D、E、F,证明:D、E、F三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50c64f2f03147277aad392390c1c483d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/800c5e266b4ad8462a46970f0a232d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24006d28116bc097933cc90bcc0ea69f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ad3a1ea6790177130e16c2124984087.png)
![](https://img.xkw.com/dksih/QBM/2018/12/4/2089523208183808/2091037945249792/STEM/4a968c24c9ab408faa73f25dd09c3401.png?resizew=221)
您最近一年使用:0次
7 . 若集合
的子集A中的每个元素均可表为两个自然数(允许相同)的平方和,求集合A中元素个数的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/012e428923fdb70ddb13034ac31af1e9.png)
您最近一年使用:0次
2014高三·山西·竞赛
8 . 数列
、
满足条件
,
,
.
证明:对每个正整数
,均有(1)
,
;(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebaf2a2590bb84d646957f913d78f6dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ada18b47400ed40d1b9a1193b15413ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e194e7f25976502f399a81c56396ebd8.png)
证明:对每个正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0f9e68ae410c9fdd76b72406624f443.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acf1550ac7fc2b61e6b6bf02d3ae7581.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03ef91975d7e3fba8392f23add78c82d.png)
您最近一年使用:0次
2014高三·山西·竞赛
9 . 如图,已知
的内切圆与边
切于点
,
、
分别为
、
的内心.证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f8f01137e92c0f2e63467036ae9cce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1a1fd2fc33e89f357cef772ff6cd0e.png)
![](https://img.xkw.com/dksih/QBM/2018/12/4/2089511886684160/2090251290673152/STEM/d698fcb5927f45299b53cd0c5102ac6c.png?resizew=201)
您最近一年使用:0次