1 . 设椭圆C的两焦点为
,两准线为
,过椭圆上的一点P,作平行于
的直线,分别交
于
,直线
与
交于点Q.证明:P、F1、Q、F2四点共圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44434b647ec546fe787e2164e0be6cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/643ef7d761de0e794fc39937dc72ac6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44434b647ec546fe787e2164e0be6cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/237c115d5b39d761e1cbcae031070b70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/691b66aff81e75f4d3873fd4ef7893a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/008f02ab36d70f2a1af5c200b20bea28.png)
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2 . 将正整数数列1,2,3,…中凡是被4整除以及被4除余1的项全部删去,剩下的数按自小到大的顺序排成数列
,再将数列
中,凡是下标被4整除以及被4除余1的项全部删去,剩下的项按自小到大的顺序排成数列
.证明:每个大于1的奇平方数,都是数列{bn}中的两个相邻项的和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8748938373768d7172dc2a8d43ee2d4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc7e469f2b0f49e94895bc2e3de2e47.png)
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3 . 如图所示,BE、CF分别是锐角三角形△ABC的两条高,以AB为直径的圆与直线CF相交于点M、N,以AC为直径的圆与直线BE相交于点P、Q.证明:M、N、P、Q四点共圆.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/40cc047d-0d43-4ede-b499-1661d2553765.png?resizew=232)
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2010高三·江西·竞赛
4 . 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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2013高三·江西·竞赛
5 . 问:是否存在这样的正整数数列
,满足
,且对每个
,均有
或
;而其各项
的值恰构成
的一个排列?证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1374530d21cd2c874a3d2971e2617ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07c12c1d40b320b8e846c5a51c0d996f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f92f5c95fbe4fe82e61f9a835d4c4498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5453184e251cfe787b5965cd38426962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf76837b97dbfae3e47539039f1e1188.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a81cedf519867f53009324131bfa9e7.png)
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2013高三·江西·竞赛
6 . 如图,在四边形
中,已知
、
分别是边
、
的中点,
是对角线
上的一点,直线
、
分别于
、
的延长线交于点
、
.证明:线段
被直线
所平分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/2018/12/13/2095794429255680/2096841872392192/STEM/f67d6064bf81442e9e0b0f939c7ad981.png?resizew=166)
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7 . 如图,D为△ABC的旁心,点A关于直线DC的对称点为E.证明:
![](https://img.xkw.com/dksih/QBM/2018/12/4/2089398193160192/2089561267060736/STEM/08415767a40e426aa40ea52ce1b5e09e.png?resizew=177)
(1)B、C、E三点共线;
(2)A、B、D、E四点共圆
![](https://img.xkw.com/dksih/QBM/2018/12/4/2089398193160192/2089561267060736/STEM/08415767a40e426aa40ea52ce1b5e09e.png?resizew=177)
(1)B、C、E三点共线;
(2)A、B、D、E四点共圆
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8 . 如图,CD为椭圆
的一条直径,过椭圆长轴的左顶点A作CD的平行线,与椭圆交于另一点N,与椭圆短轴所在直线交于点M.证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dda1af75e15570adc20926250880994.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/31/bdd3639d-5cb2-4701-8aab-178526f99e6f.png?resizew=208)
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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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