1 . “已知函数
,求证:
与
中至少有一个不少于
.”用反证法证明这个命题时,下列假设正确的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c24ee8841e69ee41e4334f6722a34eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6293ba81dae8199052020ac4ed4ae35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e444bfdaf334e8a0d972ca9075e470b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
A.假设![]() ![]() |
B.假设![]() ![]() |
C.假设![]() ![]() ![]() |
D.假设![]() ![]() ![]() |
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2018-07-08更新
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212次组卷
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2卷引用:【全国市级联考】辽宁省辽阳市2017-2018学年高二下学期期末考试数学(文)试题
2 . 如图,在四棱台
中,底面
是菱形,
,
,
平面
.
(1)证明:
.
(2)棱
上是否存在一点E,使得二面角
的余弦值为
?若存在,求线段
的长;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50cb59da6e7882e4328b766777ee15d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/3a816394-77b8-4c6f-ae62-e3e25149cbbb.png?resizew=204)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a382ccd078374f1efebb26a43599e596.png)
(2)棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54ad0edb590fa1cc97383714f87cbda6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af46237d7279ffb682d57e4e7b57a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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2023-12-28更新
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593次组卷
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4卷引用:辽宁省辽阳市2023-2024学年高二上学期1月期末考试数学试卷
辽宁省辽阳市2023-2024学年高二上学期1月期末考试数学试卷江西省“三新”协同教研共同体2023-2024学年高二上学期12月联考数学试卷 (已下线)高二数学开学摸底考01(新高考地区)-2023-2024学年高中下学期开学摸底考试卷(已下线)第七章 应用空间向量解立体几何问题拓展 专题一 立体几何非常规建系问题 微点3 立体几何非常规建系问题(三)【培优版】
解题方法
3 . 已知抛物线C:
,过点
的直线l交C于A,B两点.
(1)若线段AB的中点为
,求l的斜率;
(2)证明:以线段AB为直径的圆过坐标原点O.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af74113f38fffeed8075e57d7f9d2533.png)
(1)若线段AB的中点为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1422ec2a1e97bed47cff6a0a0b8920e6.png)
(2)证明:以线段AB为直径的圆过坐标原点O.
您最近一年使用:0次
4 . 已知函数
.
(1)若
,求
的图象在
处的切线方程;
(2)若
有两个极值点
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb41724d9a030cc2694a58dee5387494.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd876a2ed79c64bacc3e64b8ee92735e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b725fdc8de9800f2692f6fea8585b1e9.png)
您最近一年使用:0次
2023-07-07更新
|
458次组卷
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5卷引用:辽宁省辽阳市2022-2023学年高二下学期期末考试数学试题
名校
5 . 如图,在四棱锥
中,
,
,
,
,O为BD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/93c016e1-d769-48d9-a7fa-ae437f30b7b3.png?resizew=169)
(1)证明:OP⊥平面
.
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02bd5cfe804460846423e77f72db10f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c8da8430ae9b811b82527eb944cea18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef699f5dc072b853cfe700c6f1abbbae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae8c7b69e2eed99438c8ceaa2b5d2cce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b57478478b0a2efceac49aef02fe01a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/93c016e1-d769-48d9-a7fa-ae437f30b7b3.png?resizew=169)
(1)证明:OP⊥平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/222caeed69cf757f2fe4ed030bdd0942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b2444e7dfd55d5738e153e857738aa.png)
您最近一年使用:0次
2023-12-20更新
|
279次组卷
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9卷引用:辽宁省辽阳市2019-2020学年高二上学期期末数学试题
6 . 从①
,②
两个条件中任选一个填入横线上,并解答下列问题.已知正项等差数列
的前
项和为
,且________.
(1)证明:数列
为等差数列.
(2)若
,证明:
.注:如果选择多个条件解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d5c9abd937e015219fb01194ea74f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da862434de47f5ee575d3dff9172ba4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/832d1e3a06f59a35396aac6e12c5e2ee.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76341c0fba917524b97396a27f2baf70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf87aa38934e06e9d2b3cd060afaff21.png)
您最近一年使用:0次
7 . 在①C的渐近线方程为
②C的离心率为
这两个条件中任选一个,填在题中的横线上,并解答.
已知双曲线C的对称中心在坐标原点,对称轴为坐标轴,点
在C上,且______.
(1)求C的标准方程;
(2)已知C的右焦点为F,直线PF与C交于另一点Q,不与直线PF重合且过F的动直线l与C交于M,N两点,直线PM和QN交于点A,证明:A在定直线上.
注:如果选择两个条件分别解答,则按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d3051f43ac48c0a730a791b8a93ad37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
已知双曲线C的对称中心在坐标原点,对称轴为坐标轴,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13428e6305dfc0ca9883044f525b6b5a.png)
(1)求C的标准方程;
(2)已知C的右焦点为F,直线PF与C交于另一点Q,不与直线PF重合且过F的动直线l与C交于M,N两点,直线PM和QN交于点A,证明:A在定直线上.
注:如果选择两个条件分别解答,则按第一个解答计分.
您最近一年使用:0次
2023-01-14更新
|
771次组卷
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5卷引用:辽宁省辽阳市协作校2022-2023学年高二上学期期末考试数学试题
辽宁省辽阳市协作校2022-2023学年高二上学期期末考试数学试题甘肃省庆阳市2022-2023学年高二上学期期末考试数学试题(已下线)第04讲 3.2.2双曲线的简单几何性质(2)山东省烟台市龙口第一中学等校2023-2024学年高二上学期12月月考数学试题(已下线)2023年新课标全国Ⅱ卷数学真题变式题19-22
8 . 如图,三棱柱
的底面ABC是正三角形,侧面
是菱形,平面
平面ABC,E,F分别是棱
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/19273376-faf9-4e67-8c9f-e2155b474557.png?resizew=239)
(1)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
平面
.
(2)若
,
,
,求平面ABC与平面EFG所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61cdaadeae37736a1e6dd93fa1fe712f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/19273376-faf9-4e67-8c9f-e2155b474557.png?resizew=239)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93375ca41cdaac319b79f05108f7fc24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59a6ae5630f5b5be2bbdd8ef05c0baad.png)
您最近一年使用:0次
解题方法
9 . 如图,在底面为矩形的四棱锥E-ABCD中,
底面ABCD,
,G为棱BE的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/7dabaf3e-cd96-405c-bed8-4c7848632f04.png?resizew=190)
(1)证明:
平面BCE.
(2)若
,
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/7dabaf3e-cd96-405c-bed8-4c7848632f04.png?resizew=190)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071159cac13097ea0928285bc1be66d8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9376cec1d9118d461b66a8a487715e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25a634b539f828b2299b593961c142dd.png)
您最近一年使用:0次
名校
10 . 已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7af3bb87c251df069d7ec2d2c9f0155e.png)
(1)当
时,讨论
的单调性
(2)当
时,若
,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7af3bb87c251df069d7ec2d2c9f0155e.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e49916a62de77d839e0825d8b91dd777.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a882037b9ce104ecc496e0f31a139361.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7be05919cfcf516586dc96166fcd6a44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5d2a320b9ff137ce3632296c4b1d79a.png)
您最近一年使用:0次
2022-07-16更新
|
807次组卷
|
2卷引用:辽宁省辽阳市第一高级中学2021-2022学年高二下学期期末数学试题