已知椭圆
的上顶点为
,右焦点为
,直线
与椭圆交于
、
两点.试判断是否存在直线
,使得点
是
的(1)重心;(2)垂心.若存在,求出对应的直线
的方程;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7895aece9dd5a90424879ea9184037a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4a95e72206b23ff0b477d1ea9033a93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
2019高三·全国·竞赛 查看更多[1]
更新时间:2018-12-27 11:05:35
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】已知双曲线
,设其实轴端点为
,点
是双曲线上不同于
的一个动点,直线
分别与直线
交于
两点.证明:以线段
为直径的圆必经过定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c465114dc2665d74246240b1d4d26ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663368000ac90f582d12675aa2d1e832.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663368000ac90f582d12675aa2d1e832.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/606157f8fed8bf59811ce77ba979ed56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bfc9cfb1d1c8578ac3566490132bc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bfc9cfb1d1c8578ac3566490132bc7c.png)
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【推荐2】如图,正六边形
的中心为
,对
、
、
、
、
、
、
这七个点中的任意两点,以其中一点为起点、另一点为终点作向量.任取其中两个向量,以它们的数量积的绝对值作为随机变量
.试求
的概率分布列及其数学期望
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33470bee4febd946d39f7b63d6344c8f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/e96fb917-64f4-4024-bf48-2f1be4e4f6da.png?resizew=141)
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解答题-证明题
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适中
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【推荐1】设椭圆
,
,过原点
引射线分别与椭圆
、
交于点
、
,
为线段
上一点.
(1)求证:
、
、
成等比数列的充要条件点
的轨迹方程为
.
(2)试利用合情推理,将(1)的结论类比到双曲线得出相应的正确结论(不要求证明).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99cd361ce118bca96a731b241a9c587d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0b48878a72078d715357cd5301d5c54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c388f1f7160d3397610633dfde015fa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f645d4b09fba53f971172cd2602c691.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a82596d3e0eea2ea14448e3ede29c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e918b255600da996c1ea631f4df7759.png)
(2)试利用合情推理,将(1)的结论类比到双曲线得出相应的正确结论(不要求证明).
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解答题-问答题
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【推荐2】过椭圆
的左焦点
引倾斜角为
的直线
交椭圆于
,
两点,交两准线于
,
两点,若
,
,
成等比数列,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caf80369ceae912b700e10970a47bb51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d44e8bc37ed03f44470762748a8f942a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/967a8170c252dcdf8e29ea4ef6c99c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4dfec890cdfdda355e19463f3be813.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1a881e16b2771ac63f6996dfb539a2e.png)
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名校
【推荐1】已知点G为
的重心.
(1)求
;
(2)过G作直线与AB、AC两条边分别交于点M、N,设
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9802946e68ae1c7153b4496ee14735.png)
(2)过G作直线与AB、AC两条边分别交于点M、N,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9545f42dc3bb78dabdb73891f2e4a69c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/301af152850e2c795bd385d0d10836f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f0b84ee4ed90face0993d4f4dda379.png)
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【推荐2】已知△ABC的三个顶点在椭圆
上,坐标原点O为△ABC的重心,证明:△ABC的面积为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
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【推荐1】在不等边
中,
、
、
是三个内角的平分线(
,
,
),
、
、
是
内切圆
上的三个点,且使得
、
、
(
、
、
)均与
相切.设
的外心、垂心分别为
、
,记
、
、
、
、
、
的中点分别为
、
、
、
、
、
.证明:
、
、
(
)三条直线交于一点
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ec7b39ec6b2bbfc75a2138f601f6d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6428870b43fc8d8d0a9f36fb473ff65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79c25815f5d8e948cf30c9e0abe56928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e238cc4fa07d6a8dab291d0ba43d76a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751b16753f54297b81316b2ee840d78f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38dae3c7302baaa87dae2e2e62032489.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79516f18a7daf0ad467a48e16d0e65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7712ed4fd550f0b60dc2df5b6f75002f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4de790cbd2dfd7fc6175834cfb7df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0c3464cf2a6154e1532d4406501b49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15f4454a161eecf193f0228d1ee51caa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85761dbe9320a51595ab2bcfc2ebe608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/785c801b128346a59b13df2fc2194962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79516f18a7daf0ad467a48e16d0e65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](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/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a71fc9c0068109dad1382354570665.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e1c28b884ea750661f4d881b7c0f9d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92d2e38b2657b82a9e8e9789d021ccbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fc8d0d3701ae2205a178ef9afe95486.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd74add83d098d62539e2d8234e2d7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59c709117ab1d3ef620883a732aed68b.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】已知
、
分别为椭圆
的左、右焦点,点
在椭圆
上,且
的垂心为
.
(1)求椭圆
的方程;
(2)设
为椭圆
的左顶点,过点
的直线
交椭圆
于
、
两点.记直线
、
的斜率分别为
、
,若
,求直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851a5d6ec23256f9b4a9e98aa92945fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ffae9ccfe459dd70e5c7226ce217fa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/002ed1ebb2cb936e10ab478789f91c7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b812c07b77716a865ce79288cd5719b4.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c33c3b37aa383f2a8f60af894ae69c40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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