2011高三·吉林·竞赛
1 . 点
满足平面区域![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2592cc6340c7ae3de25f93930314350b.png)
,点
满足
.则
的最小值为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee82283f06cedef32eb15b87964f5d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2592cc6340c7ae3de25f93930314350b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a59287425f7467c4e3101b74250bad2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d259822ab64b8626f3893b8432673358.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ba31412a6ff27e6114a8806beedcbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/517a8041c31709c7ae8f2fb287c961db.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2011高三·吉林·竞赛
2 . 在正五棱柱
的侧棱
上有一点
,若截面
与侧面
互相垂直,则这样的点
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afb94145069d895e289f871c9deb403a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/919f4530ff80da15d204fa67edadb00b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5bb280919fefd301bcc544e9c7c65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
A.有且仅有一个 |
B.有时有两个,有时有一个 |
C.恰有两个 |
D.有时不存在 |
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3 . 一个由空间中的点组成的集合
满足性质:
中任意两点之间的距离互不相同.假设
中的点的坐标
都是整数,并且
、
、
.证明:集合
的元素个数小于
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b525d8c768efd801ab58bc4c0da9221e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b38801a4ec7a47cfd6cea29f742248b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efd7417b43749d2062dda327e4ceb2cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5bc579800ed2f37f89cc21404447181.png)
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2009高三·吉林·竞赛
4 . 如图,在
中,
,有一个圆内切于
的外接圆,且与
、
分别切于点
、
.求证:线段
的中点
是
的内心.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/7dafbd29-8cc7-4dc2-8cc2-7f9d020a17da.png?resizew=159)
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5 . 已知数列
中,
,且
.
(1)试求
的取值范围,使得
对任何正整数
都成立;
(2)若
,设
,并以
表示数列
的前
项的和,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/390636a89883bd64bf8da9bf8654aff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91d40e2e0375529a93e94416a598e2a7.png)
(1)试求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2798e1dcab1f7f0fe3b8a94b3cd6a88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fc336b4a83bf6d66c4afcc431597f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2824d45414f707e4309e36f107ff9a62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b0b2c7b4cbd960f7e65fb82c3764c29.png)
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2009高三·吉林·竞赛
6 . 若定义在集合
上的函数
满足:对任意的
、
,都有
,则称函数
是
上的凹函数.
(1)试判断
是否是
上的凹函数?
(2)若
是
上的凹函数,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3830ea6ea58c99a0fc1adadccac0fab2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d3dbbb678b0b13c53ae5afa3f32d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(1)试判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3f24cb3a9224fdf86183318970ec2bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13c89902aefa14624faa9d33ae32fb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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2009高三·吉林·竞赛
7 . 若
、
、
,求证:
.
![](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/44d15037419d9e35c44d803c4fa3cea7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0f6095177be4f01c29311b0a01e6cde.png)
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2009高三·吉林·竞赛
8 .
的小数点后一位数字是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dda5b2a809ae24245a9be8979a015f76.png)
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2009高三·吉林·竞赛
9 . 对空间中的六个点两两连线,用红、黄两种颜色对这些边染色,则同色三角形至少有______ 个.
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