解题方法
1 . 如图,在四棱锥
中,底面
为正方形,
平面
,已知
,
为线段
的中点.
![](https://img.xkw.com/dksih/QBM/2016/10/15/1573071808937984/1573071815278592/STEM/6ad3829bd40a43e59019c4a3f9ff20ee.png?resizew=185)
(Ⅰ)求证:
平面
;
(Ⅱ)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c753cb1eb73fd8d136d00462970797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2e50f0d02d0bd51ae361d276ed9dea4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2016/10/15/1573071808937984/1573071815278592/STEM/6ad3829bd40a43e59019c4a3f9ff20ee.png?resizew=185)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c372d059202ec388960b125d4a87dc84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4734735213b599a9915e1ed91a5d8ce4.png)
(Ⅱ)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09d9d486b7f91ba933210dd013a7f2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
您最近一年使用:0次
解题方法
2 . 设
是椭圆
的左、右焦点,
是椭圆
上任意一点.
(1)记
,求证:
;
(2)若
,点
,已知椭圆
上的两个动点
满足
,当
时,求直线
斜率的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc6f95c70af169c4af991af8c5e3c0a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faa4ae8d7537feb98c7de50302705609.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ab53d020bf8f3afcec53fc38f64f6c9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9bece414af7ecb2d796dc8a6f549e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12796b93f8489abab501f6896d5359dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86050930230676a4eb344c0c734acc6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44a29226a0a98dce2a2353e9214a901f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
3 . 如图,在平面直角坐标系
中,抛物线
的准线
与
轴交于点
,过点
的直线与抛物线交于
两点,设
到准线
的距离
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/905444fc-3380-4c7a-b6d4-c4f5525f43f1.png?resizew=198)
(1)若
,求抛物线的标准方程;
(2)若
,求证:直线
的斜率的平方为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21be4ca5919e23d17c902a3b09b0f0bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05193d9096bd9da9230acc14228aa4e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a494f7d59770ed4cf936ba2558b64cfe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/905444fc-3380-4c7a-b6d4-c4f5525f43f1.png?resizew=198)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/901fffa7b5b0506133e1c2ddeb06b658.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07931dc76f304285fdc75a1bb9e7776b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
2016-12-04更新
|
553次组卷
|
2卷引用:2016届陕西省安康市高三第三次联考理科数学试卷
4 . 如图,在三棱锥
中,
,
在底面
上的射影为
,
,
于
.
![](https://img.xkw.com/dksih/QBM/2016/3/8/1572526056292352/1572526062632960/STEM/5f01c63d515143c3ac60a0599554b333.png?resizew=237)
(1)求证:平面
平面
;
(2)若
,
,
,求直线
与平面
所成的角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee0f630195bcf6c3ca8f4fdeff43b082.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa30a9ee227af2b387cf6e028c20d7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2016/3/8/1572526056292352/1572526062632960/STEM/5f01c63d515143c3ac60a0599554b333.png?resizew=237)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf6dc837ae85207789b94d109c5c2eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a0e5697eca3f5205cb7b343648240bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7502eee6f33e8c940dec63ab6473c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ddc76d96d6951ebfef3fe63892a1114.png)
您最近一年使用:0次
2016-12-04更新
|
831次组卷
|
4卷引用:2016届陕西省西安市一中高三下学期第一次模拟理科数学试卷
5 . 如图,在△
中,
,
,点
在
上,
交
于
,
交
于
.沿
将△
翻折成△
,使平面
平面
;沿
将△
翻折成△
,使平面
平面
.
![](https://img.xkw.com/dksih/QBM/2016/1/11/1572427825954816/1572427832197120/STEM/4cea3d5d4c09453c88d1e9fde3c41d94.png)
(1)求证:
平面
.
(2)设
,当
为何值时,二面角
的大小为
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8f73df2a34f270b586c550678edb94b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc130e4f2499cc620a0df6542d8127b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a41e5ea76060e034d1241d0d9d4f29b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0a333a382efa714ee244945fa4c5f52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bec7e56107b5f2f34e420caffd1159b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7842129706ac4ec8d6e0e0c61d91582.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aa6761d5ef72be959c22b0d3a8feeeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5395f1811518a917a30e5949c4c8fc57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9623b46074ae1740ea1a3aafffabada5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60c07aedee03542659e07cf8b23240b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/2016/1/11/1572427825954816/1572427832197120/STEM/4cea3d5d4c09453c88d1e9fde3c41d94.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2016/1/11/1572427825954816/1572427832197120/STEM/711aa295caab460280515db220aa0ad3.png)
![](https://img.xkw.com/dksih/QBM/2016/1/11/1572427825954816/1572427832197120/STEM/f6e74dcf43c54f64b3240fe55849bf1f.png)
(2)设
![](https://img.xkw.com/dksih/QBM/2016/1/11/1572427825954816/1572427832197120/STEM/4c9e73bfd23d456386879fc238843d99.png)
![](https://img.xkw.com/dksih/QBM/2016/1/11/1572427825954816/1572427832197120/STEM/0b889fd49b7647ecaec128158eb280ae.png)
![](https://img.xkw.com/dksih/QBM/2016/1/11/1572427825954816/1572427832197120/STEM/0ccd6a35013f4c538adccb8250aa53fb.png)
![](https://img.xkw.com/dksih/QBM/2016/1/11/1572427825954816/1572427832197120/STEM/e7d64a4422c34359a3f2cff84fd859a8.png)
您最近一年使用:0次
2016-12-04更新
|
990次组卷
|
2卷引用:陕西省西安市高新第一中学2021届高三下学期二模理科数学试题
名校
6 . 如图,已知长方形
中,
,
,M为DC的中点.将
沿
折起,使得平面
⊥平面
.
(1)求证:
;
(2)若点
是线段
上的一动点,问点
在何位置时,二面角
的余弦值为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a88c44f558705de3bcefcfc0ece96b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e1e88b36ff71fe69c07bade0f95f1ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ddb7c2ca1b6bee86cb24fed02e40da2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0760712e3e2ea02b755b751e760d0c55.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/804c0e2a375b5f4ff1c420532968efc3.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a5266895d3c1fcb350a745bc779433b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/18/df4b3996-3df6-4463-b548-c12e40c08c80.png?resizew=368)
您最近一年使用:0次
2016-12-03更新
|
1657次组卷
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19卷引用:陕西省西安市长安区第一中学2018届高三上学期第八次质量检测数学(理)试题
陕西省西安市长安区第一中学2018届高三上学期第八次质量检测数学(理)试题陕西省宝鸡市八校2021届高三下学期联合检测理科数学试题2016届湖北武汉华中师大一附等高三上第一次联考理数学卷2015-2016学年湖南五市十校教改共同体高二下期末数学(理)试卷2019年9月四川省高三联合诊断考试数学(理科)试题(已下线)2020届天津市河东区高三高考一模数学试题安徽省合肥六中2019-2020学年高二下学期第一次段考数学(理)试题湖北省孝感市汉川市第二中学2020-2021学年高二上学期期中数学试题浙江省杭州市学军中学2020-2021学年高二上学期期末数学试题(已下线)【新东方】高中数学20210429—006【2020】【高二上】安徽省淮北市树人高级中学、萧县实验中学2020-2021学年高二上学期期中联考理科数学试题河北省冀州中学2018-2019学年高二上学期期中数学(理)试题天津市西青区杨柳青第一中学2021-2022学年高三上学期第一次阶段检测数学试题(已下线)二轮拔高卷08-【赢在高考·黄金20卷】备战2022年高考数学模拟卷(新高考专用)湖南省长沙市第一中学2022-2023学年高二上学期入学考试数学试题河南省禹州市北大公学禹州国际学校2022-2023学年高二上学期开学考试数学试题河南省鹤壁市高中2022-2023学年高二上学期10月居家测试数学(平行班)试题湖南省岳阳市湘阴县知源高级中学2022-2023学年高三上学期第二次月考数学试题湖北省襄阳东风中学2022-2023学年高二上学期9月月考数学试题
7 . 如图,在底面为菱形ABCD的四棱柱ABCD—A1B1C1D1 中,∠ABC=60°,AA1=AB=2,A1B=A1D=2
.
![](https://img.xkw.com/dksih/QBM/2015/6/29/1572153449971712/1572153455640576/STEM/07c2a5b8dc79448494f46137ff8742b7.png)
(1)求证:AA1⊥面ABCD;
(2)若点E在A1D上,且
=2,求二面角E—AC—D.
![](https://img.xkw.com/dksih/QBM/2015/6/29/1572153449971712/1572153455640576/STEM/920a619fab8c4d02a4d687c922bf2cf2.png)
![](https://img.xkw.com/dksih/QBM/2015/6/29/1572153449971712/1572153455640576/STEM/07c2a5b8dc79448494f46137ff8742b7.png)
(1)求证:AA1⊥面ABCD;
(2)若点E在A1D上,且
![](https://img.xkw.com/dksih/QBM/2015/6/29/1572153449971712/1572153455640576/STEM/21f32d6ce76e497687528bd7a872de75.png)
您最近一年使用:0次
13-14高二·江苏扬州·阶段练习
名校
8 . 如图,在四棱锥
中,
平面
,底面
是菱形,
,
.
![](https://img.xkw.com/dksih/QBM/2018/11/28/2085346715811840/2086577770446848/STEM/36349ff53df142a38c05a06642f8b7bf.png?resizew=146)
(1)求证:平面
平面
;
(2)若
,求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://img.xkw.com/dksih/QBM/2018/11/28/2085346715811840/2086577770446848/STEM/36349ff53df142a38c05a06642f8b7bf.png?resizew=146)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04c222223dae9ef27d4c132534d9848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829f9180ddd9aa1a0ee0dc520f4e0b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
您最近一年使用:0次
2016-12-03更新
|
1442次组卷
|
3卷引用:2017届陕西省咸阳市高三模拟考试(三)数学(理)试卷
2017届陕西省咸阳市高三模拟考试(三)数学(理)试卷【全国百强校】陕西省西安市长安区第一中学2019届高三上学期第二次检测数学(理)试题(已下线)2014-2015学年江苏省高邮市第二中学高二学情检测数学试卷
2014·湖南怀化·二模
9 . 如图,椭圆
的长轴长为
,点
、
、
为椭圆上的三个点,
为椭圆的右端点,
过中心
,且
,
.
![](https://img.xkw.com/dksih/QBM/2014/6/3/1571749050974208/1571749056856064/STEM/aa990d5460e143d597725fc1f1443f44.png)
(1)求椭圆的标准方程;
(2)设
、
是椭圆上位于直线
同侧的两个动点(异于
、
),且满足
,试讨论直线
与直线
斜率之间的关系,并求证直线
的斜率为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c8525a7c1b700128cf34e28a5a50c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1136baa1259358a8569f3d50a259ab59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e774156aee9ca35e5c95411301557ac2.png)
![](https://img.xkw.com/dksih/QBM/2014/6/3/1571749050974208/1571749056856064/STEM/aa990d5460e143d597725fc1f1443f44.png)
(1)求椭圆的标准方程;
(2)设
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](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/2303997a297935839da8bc070bc3c3d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
您最近一年使用:0次
2016-12-03更新
|
1916次组卷
|
6卷引用:2020届陕西省汉中市高三下学期第二次模拟检测文科数学试题
2013·内蒙古赤峰·一模
名校
10 . 如图,在四棱锥
的底面
是正方形,
平面
,
为
上的点,且
.
;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](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/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc6608ead81e23980a70e48a03e7bc1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b757706eee506a078fc25e3f33a70cb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac0242f50dbd966ae99db9e0f3b760b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af3af94daf0394610273f06189ac1348.png)
您最近一年使用:0次
2016-12-04更新
|
715次组卷
|
5卷引用:2016届陕西洛南永丰中学高三考前最后一卷理数学试卷
2016届陕西洛南永丰中学高三考前最后一卷理数学试卷(已下线)2014届内蒙古赤峰市全市优质高中高三摸底考试理科数学试卷(已下线)2014届广东省百所高中高三11月联考理科数学试卷广东省梅州市兴宁一中2020届高三下学期3月月考数学(理)试题河南省周口市川汇区周口恒大中学2023-2024学年高二下学期4月期中数学试题