1 . 已知函数
.
(1)当
时,求证:
;
(2)证明:
在
上单调递减;
(3)求证:当
时,方程
有且仅有2个实数根.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04557ab042ce57739d7e3da3aa98494b.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ffd1f6bd3686a07efa4086a02b96a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2b75051479c8bd96402038bea4ec12.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de2ddd34bd03fccd33fb45335bdae36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72728cdc6b1c5521eeba55ca804d2d74.png)
(3)求证:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8665030cbc65785846edb65e62e5652e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d99cbcd39135251eff7c9e7e7a37e232.png)
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2 . (1)用分析法证明:
(当且仅当
时等号成立);
(2)设
为曼哈顿扩张距离,其中
为正整数.如
.若
对一切实数
恒成立.设
,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c76da5edd4633d1fb68e3a4ede06473.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd68c14adb3cf12d8f77aec55a053284.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350bc6680b01296d43c94b4d2477c1f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a47a512e82abbcd0a647239620e8be39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c70c57ebaf9a10ac167d32017564f027.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2684b72f9f38f5046c8ecd4280b7b14b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f916ad5246cc2f42386422d8726ecdfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/485a2d99320384a0857b00ce9ab9e990.png)
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名校
解题方法
3 . 如图所示,已知点P是平行四边形
所在平面外一点,M,N,Q分别
,
,
的中点,平面
平面
.
![](https://img.xkw.com/dksih/QBM/2021/12/15/2873155538780160/2873622982402048/STEM/053f9d3b-61ac-46be-a07a-5526077134ff.png?resizew=335)
(1)证明平面
平面
;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a09d03d26008b17d89e98125eff110c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d19526cadbce0e984c2edc3f31d591.png)
![](https://img.xkw.com/dksih/QBM/2021/12/15/2873155538780160/2873622982402048/STEM/053f9d3b-61ac-46be-a07a-5526077134ff.png?resizew=335)
(1)证明平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b28a07491270be75a3697538bec706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edbf6462666c8015e7de28e344af30b2.png)
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2021-12-16更新
|
841次组卷
|
4卷引用:陕西省延安市黄陵中学2021-2022学年高一上学期期末数学试题
陕西省延安市黄陵中学2021-2022学年高一上学期期末数学试题陕西省西安中学2021-2022学年高一上学期12月第二次月考数学试题(已下线)8.5 空间直线、平面的平行(已下线)第08练 点线面的位置关系-2022年【暑假分层作业】高一数学(苏教版2019必修第二册)
解题方法
4 . (1)证明:
;
(2)已知:
,
,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/734f585f8cfc92522f6daf997ebec04d.png)
(2)已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adf913c92060a7bad4de1ee8c04d011e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94752276c75f22d290087179226d450f.png)
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5 . 设直线
,曲线
.若直线
与曲线
同时满足下列两个条件:①直线
与曲线
相切且至少有两个切点;②对任意
都有
.则称直线
为曲线
的“上夹线”.
(1)已知函数
.求证:
为曲线
的“上夹线”;
(2)观察下图:
的“上夹线”的方程,并给出证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70087bf78bee970f6ecf583ca1fccc42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0016d106579d6b26cf2960cf744f317.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d9dc155203792c9983b2118b7730088.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(1)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c043c3bf7b638f8bb635ee098130560.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c31c4f39399ec245a67db2933ed639f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)观察下图:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d08fe48eafb7a58cb673cc4bce2aa0e7.png)
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6 . (1)证明:
;
(2)已知:
,
,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/734f585f8cfc92522f6daf997ebec04d.png)
(2)已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a945b19a5442a7edfa8d0f1d4ef488da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b3eeae9616ea62a988bde7a82ddc98.png)
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2021-05-28更新
|
496次组卷
|
4卷引用:陕西省西安中学2021-2022学年高二上学期期末理科数学试题
7 . (1)求证:当a、b、c为正数时,
.
(2)已知
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077ed1711b7328d5c4e3b3f2e63f6ba1.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b6c5526947e9bef051bc3bdf7fd186d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b1411bbc505b5056e68e077d18e06b.png)
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2017-07-28更新
|
470次组卷
|
2卷引用:陕西省西安现代职业高中2020-2021学年高二下学期期末文科数学试题
名校
解题方法
8 . 如图,在四棱锥
中,
为正三角形,平面
平面
,
//
,
,
.
![](https://img.xkw.com/dksih/QBM/2019/6/7/2220515209068544/2220763683184640/STEM/0ad9b1c0afd04d89bce4301d90237f4b.png?resizew=118)
(1)求证:平面
平面
.
(2)求三棱锥
的体积.
(3)在棱
上是否存在点
,使得
//平面
?若存在,请确定点
的位置,并证明;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d43dfede0d7e17c2ad89ab51349e6bf0.png)
![](https://img.xkw.com/dksih/QBM/2019/6/7/2220515209068544/2220763683184640/STEM/0ad9b1c0afd04d89bce4301d90237f4b.png?resizew=118)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342d452a7b850cd3a15b23619ad39bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
(3)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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2017-08-07更新
|
1421次组卷
|
5卷引用:【全国百强校】陕西省西安市长安区第一中学2017-2018学年高一下学期期末考试数学试题1
9 . 正△ABC的边长为2, CD是AB边上的高,E、F分别是AC和BC的中点(如图(1)).现将△ABC沿CD翻成直二面角A-DC-B(如图(2)).在图(2)中:
(1)求证:AB∥平面DEF;
(2)在线段BC上是否存在一点P,使AP⊥DE?证明你的结论;
(3)求二面角E-DF-C的余弦值.
您最近一年使用:0次
2016-12-04更新
|
1122次组卷
|
3卷引用:2015-2016学年陕西省城固县一中高二上学期期末考试理科数学试卷
2015-2016学年陕西省城固县一中高二上学期期末考试理科数学试卷2018届高考数学高考复习指导大二轮专题复习:专题五 立体几何 测试题5(已下线)专题06+立体几何-2021高考数学(理)高频考点、热点题型归类强化
12-13高二上·浙江杭州·期中
解题方法
10 . 如图,直三棱柱
中,已知
,
,
是
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/9/1f651409-9fc2-4241-b792-5828526e8e09.png?resizew=181)
(1)求证:
平面
;
(2)当点
在
上什么位置时,会使得
平面
?并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e47739be8ea23755014d80b408e6a36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/9/1f651409-9fc2-4241-b792-5828526e8e09.png?resizew=181)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/762b8cac66d86a013ba839266b023e54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bea124cef7ab3fd8069243e9894d1c59.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4560fa4ad459b58b723c74bd24e51ebf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/431e8bf1a5f9ac9a2ec82c11f31a4afe.png)
您最近一年使用:0次