2024高三·全国·专题练习
1 . 如图,在平面直角坐标系
中,M,N分别是椭圆
的顶点,过坐标原点的直线交椭圆于P,A两点,其中P在第一象限,过P作x轴的垂线,垂足为C,连接AC,并延长交椭圆于点B,设直线PA的斜率为k.对任意
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d80b861ba40387cb2bcd04945f5a371a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0d68648b10fce54dfc19c5ee60086d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83640592853a53872d7af69c0cffc1bb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/11/a588c886-fd20-45b5-beb5-508af729f3e7.png?resizew=156)
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2023高三·全国·专题练习
2 . 若实数
,
,
两两不等,且
,
,证明
,并由本结论说出
的一条几何性质.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a081b7a43e94312031f2bd1357defb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72e44017e74a651ae0e50ebf20f4191a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b9893e5d5836dc60ec5f25c723fd02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5894f0258b4b0acb81412de25a8478de.png)
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3 . 如图,已知
内接于抛物线
,且边
所在直线分别与抛物线
相切,F为抛物线M的焦点.求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/9363e490-d4f9-4149-82da-1203d0f10886.png?resizew=200)
(1)边
所在直线与抛物线M相切;
(2)A,C,B,F四点共圆.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f480c60b88b546cb15d3b5622e212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12bc980a6ff5fe01b746c65af072a05e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19409d6d120387b3bccd934c4911bb45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd646f98b097a1b09f0b8a76ec399340.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/9363e490-d4f9-4149-82da-1203d0f10886.png?resizew=200)
(1)边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)A,C,B,F四点共圆.
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4 . 已知椭圆
,点P、Q在椭圆C上,满足在椭圆C上存在一点R到直线
、
的距离均为
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5ec9cd65757e3ec520a74c94c2482a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72f4f765a5457a67321aa228fbee7d68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b714ca268a49f0e22423b137b98b54d.png)
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5 . 已知
是抛物线
上三个不同的动点,
有两边所在的直线与抛物线
相切.证明:
的重心在定直线上.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7440ccd451dda37d02bc724c63c1e38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4620b9b61b02657ba69aeec3e1006f66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fbfc0ce508977423897abed5933856f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b8864f06fbdef835a9fb37abb40d80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fbfc0ce508977423897abed5933856f.png)
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6 . 如图所示,设k>0且k≠1,直线l:y=kx+1与l1:y=k1x+1关于直线y=x+1对称,直线l与l1分别交椭圆
于点A、M和A、N.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/1/de2a14e9-1b7a-4097-971d-d543239d8a57.png?resizew=166)
(1)求
的值;
(2)求证:对任意的实数k,直线MN恒过定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8868e2ba4401d727f1bcb1f5483b48f5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/1/de2a14e9-1b7a-4097-971d-d543239d8a57.png?resizew=166)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec01614eda195be40a7d5fd494f7f344.png)
(2)求证:对任意的实数k,直线MN恒过定点.
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2020-05-11更新
|
616次组卷
|
2卷引用:2019年全国高中数学联赛广西壮族自治区预赛
7 . 在直角坐标系xOy的横轴上取两个定点
、
,在纵轴上取两个动点
、
,满足
,
(a、b为常数),联结
、
交于点M.
(1)求点M所在的曲线P;
(2)过点
作斜率为
的直线交曲线P于点A、C,若
,且点B也在曲线P上,求证:
为定值
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97e13bd267451816619e4b7152d3c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff5ffcc021ee4b796dab4e934e069069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8300ca9771b3962ae13085b37c95fd51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0b0e392a9768cecaa6b81f0a058d27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b30935e4159b52a09b0cc6f20394763.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a112d71e48de9093b85d248c6ee2ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6d9474ef6e91a668a30481a7c9ca34f.png)
(1)求点M所在的曲线P;
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fa0b43d088301039f45d12ef9ebf551.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f0cb2cf48904181b66eb4e599cfd30e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75175e9684a5d4154fcb3cd0a2ce732c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d9afb0e4c4926d542f735722cbba04e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
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8 . 已知过椭圆C上一点P与对称轴平行的直线交椭圆C的两准线于点
它们分别与同侧焦点
的连线交于点Q.求证:
四点共圆.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89932e7c2c3ca8b5e984d4daf0dddcd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c38928a92bc4b44ed3c9b89769f5372.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b6d0e50cf6ac3f4e39e0138d8a81aec.png)
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9 . 已知抛物线
及定点
、![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761b5ed5a4a0300cd10948b77e45ad46.png)
.
是抛物线上的点,设直线
、
与抛物线的另一交点分别为
、
.求证:当点
在抛物线上变动时(只要
、
存在且
),直线
恒过一个定点,并求出这个定点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc58c62444bf42a25289c45425a00f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8530bca5123179cfede86d03738495e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761b5ed5a4a0300cd10948b77e45ad46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3344b21e76e2006bace2982cf9714541.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b104090ea2ac34be58a76a4e0e95cb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df1d9b712b639c8b6809c9f3ae03706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b104090ea2ac34be58a76a4e0e95cb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df1d9b712b639c8b6809c9f3ae03706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3d13c7dfe85ea3ef8c7cd06224651a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dedd84baa5219a2af415be51947c301.png)
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10 . 在椭圆
外一直线
上取![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
个不同的点
,过
向椭圆
作切线
、
,切点分别为
、
.记直线
为
.
(1)若存在正整数
、
(
、
,
),使得点
在直线
上,证明:点
在直线
上;
(2)试求直线
将椭圆
分成的区域的个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dea03b2cf3da663a4a7acdffc15edbb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdab6421fcc985bc894cdfeb8f23bb10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6321ba6270de4f43b385af786aba7346.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d11299bda4bca24ea7a952c71242cd24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6b9f9d6bf28a4687a140ec0a4e0319f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e819b87f90651d89fcd258c276294e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdc5c895153932c3e827a464664cef90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ebc2e00c6870065bc4d216ac17fb63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/468edcfef1bcd7e74491a57a70c1bcb1.png)
(1)若存在正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7600d2cfbdc6146db96cc545706004f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c3f385ba7b9f3c6e9729ee860066e0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a498a3bb9809ca8a71cc1ed17e940a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e37bb15ac117629f9cbf81fe960f45a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59c709117ab1d3ef620883a732aed68b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/446c6b3dabd875fa82f12fe025132995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f59061d84ba9db3cf6a114446549e75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/468edcfef1bcd7e74491a57a70c1bcb1.png)
(2)试求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faa56d97ce5bab0576ae8cc4a0d22917.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
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