2010高三·江西·竞赛
1 . 给定椭圆
, ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3293f6e379ac9f758a70c1f2de805d.png)
.自椭圆上异于其顶点的任意一点P,作
的两条切线,切点分别为M、N.若直线MN在x轴、y轴上的截距分别为m、n,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11cab597d0877547d907e600456cdf63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3293f6e379ac9f758a70c1f2de805d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa608018e8ddbc582a6c9cc9e392d56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3293f6e379ac9f758a70c1f2de805d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1275a01da93b5cc718a9378c97fb5175.png)
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2 . 等差数列
、
的前
项和分别为
、
若对任意的正整数
,均有
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b289def4092041d1c9b19bb4d1a2092f.png)
_______ .
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785622a34a256e73ed9b501252b1312.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b289def4092041d1c9b19bb4d1a2092f.png)
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2008高三·江西·竞赛
3 . 过点
作直线
,使得它被椭圆
所截得的弦的中点恰为
.则直线
的方程为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3c9708ef0dc6d6f5dcf6596d3e4f6e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6205da5e1d2730ee0b3de8bca3e29f5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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2007高三·江西·竞赛
4 . 若四位数
的各位数码
中,任三个数码皆可构成一个三角形的三条边长,则称n为“四位三角形数”.试求所有四位三角形数的个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbb31e6dc1c00e605aecddc895d14be0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c27a9af7db04a611063978a7990745e.png)
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2010高三·江西·竞赛
5 . 过抛物线
的焦点F作一条斜率为2的直线
.若
与抛物线交于点A、B,则△OAB的面积是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ac62b1ade07205ae2693ec1ab135def.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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2008高三·江西·竞赛
6 . 四面体
的六条棱长分别为7、13、18、27、36、41,且
.则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab907b31a5c323921af478cfad87afd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ec5d678ec42846e1d28301e3bfd4be.png)
A.7 | B.13 | C.18 | D.27 |
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2014高三·江西·竞赛
7 . 设
、
、
为正数.证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb35bfb6a27281fd4642004bd4a50bf3.png)
.
![](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/bb35bfb6a27281fd4642004bd4a50bf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4606ad06df34085d522b5c8846686ec1.png)
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2012高三·江西·竞赛
8 . 如图,已知抛物线
的顶点为
,
是过焦点
的一条长度为2的弦,
是
的中垂线与
轴的交点.求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344ccbf79da6ad7e3709d6fa72efb756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7110a27677d14db9991cbc80f9fb4edf.png)
![](https://img.xkw.com/dksih/QBM/2018/12/13/2095788136906752/2096481267064832/STEM/dca6bc31253746c19925c3046aef87db.png?resizew=167)
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2010高三·江西·竞赛
9 . 如图.
的一条弦AB将圆分成两部分,M、N分别是两段弧的中点,以点B为旋 转中心,将弓形AMB顺时针旋转一个角度成弓形
.若
的中点分别为P、Q,求证:MN=2PQ.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3293f6e379ac9f758a70c1f2de805d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/877bda7e850ca4a33e517fcf4a082b42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3310800e21f7c26a350214ba2d7492ce.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/1f3381f2-8c9b-488c-b70f-0e53831a0c26.png?resizew=122)
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