1 . 如图,在三棱锥
中,
,
为
的中点,
.
![](https://img.xkw.com/dksih/QBM/2021/11/12/2849774965235712/2850388739268608/STEM/f1cf6a26-d804-462c-bb1e-0fc160a36885.png?resizew=237)
(1)证明:平面
平面
;
(2)若
是边长为1的等边三角形,点
在棱
上,
,三棱锥
的体积为
,求平面BCD与平面BCE的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21be01a95cdd3149512bf95d6084fdd6.png)
![](https://img.xkw.com/dksih/QBM/2021/11/12/2849774965235712/2850388739268608/STEM/f1cf6a26-d804-462c-bb1e-0fc160a36885.png?resizew=237)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf6dc837ae85207789b94d109c5c2eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4807ca16360c0cca436e59d4be98f626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46d76c5ac5c9f0a2ec064487c02c476e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41ffdaecfb3c73d403179e5745c71a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
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10卷引用:广东省深圳市第七高级中学2022届高三上学期第四次月考(12月)数学试题
广东省深圳市第七高级中学2022届高三上学期第四次月考(12月)数学试题湖北省华中师范大学第一附属中学2021-2022学年高二上学期期中数学试题浙江省台州市书生中学2021-2022学年高二上学期第二次月考数学试题湖南省永州市第一中学2021-2022学年高二上学期第二次月考数学试题广东省深圳市宝安区2022-2023学年高二上学期期末数学试题广东省肇庆中学2021-2022学年高二上学期学段考试(三)数学试题(已下线)专题09 几何体的面积与体积问题(练)--第一篇 热点、难点突破篇-《2022年高考数学二轮复习讲练测(浙江专用)》(已下线)数学-2022届高三下学期开学摸底考试卷B(新高考专用)湖北省黄冈市蕲春县英才学校2022-2023学年高二上学期期中数学试题(已下线)期中真题必刷常考60题(22个考点专练)-【满分全攻略】2023-2024学年高二数学同步讲义全优学案(人教A版2019选择性必修第一册)
名校
2 . 判断下列结论正确的是( )
A.空间中任意两个非零向量![]() ![]() |
B.在三个向量的数量积运算中![]() |
C.对于非零向量![]() ![]() ![]() |
D.若![]() ![]() ![]() ![]() ![]() |
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4卷引用:广东省深圳市福田区红岭中学2021-2022学年高二上学期期中数学试题
广东省深圳市福田区红岭中学2021-2022学年高二上学期期中数学试题(已下线)1.1.2 空间向量的数量积运算(分层作业)(3种题型分类基础练+能力提升综合练)-【上好课】高二数学同步备课系列(人教A版2019选择性必修第一册)河南省周口恒大中学2022-2023学年高二下学期期中数学试题河南省信阳市固始县信合外国语高级中学2023-2024学年高二上学期期中数学试题
名校
解题方法
3 . 已知抛物线
:
上的点
到其焦点的距离为2.
(1)求点P的坐标及抛物线C的方程;
(2)若点M、N在抛物线C上,且
,求证:直线MN过定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7089148c36cb3c39af71de653756396a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/406db3053f2fc3878762d8a0dfc4c425.png)
(1)求点P的坐标及抛物线C的方程;
(2)若点M、N在抛物线C上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56db85c6e5d2ee49ad2bed2bdef39ffa.png)
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5卷引用:广东省深圳市高级中学等九校2022届高三上学期11月联考数学试题
广东省深圳市高级中学等九校2022届高三上学期11月联考数学试题新疆师范大学附属中学2020-2021学年高二12月月考数学(文)试题(已下线)考点40 抛物线-备战2022年高考数学典型试题解读与变式(已下线)收官卷01--备战2022年高考数学(文)一轮复习收官卷(全国乙卷)辽宁省辽东南协作体2023-2024学年高三下学期开学考试数学试题
解题方法
4 . 如图,在直三棱柱
中,
,
,M为AB的中点,N为
的中点,P是
与
的交点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/2109e591-40d2-4e44-84fd-4b74cf2234a0.png?resizew=168)
(1)证明:
;
(2)在线段
上是否存在点Q,使得
∥平面
?若存在,请确定Q的位置;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90e17995e2f71e297d94ae51c7e5b1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/2109e591-40d2-4e44-84fd-4b74cf2234a0.png?resizew=168)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e862713d078c4f06ec1f15ccd6f5a1f7.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a604466a9c8d10d557b3dfc43b547065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4e7552a39c412d882766dbcd7eeb69.png)
您最近一年使用:0次
2021-11-13更新
|
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|
3卷引用:广东省深圳市高级中学等九校2022届高三上学期11月联考数学试题
名校
5 . 如图,已知正方体
的棱长为2,
,
,
分别为
,
,
的中点,以下说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/03a04d83-d177-4291-8533-4647fcc3f042.png?resizew=160)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/03a04d83-d177-4291-8533-4647fcc3f042.png?resizew=160)
A.三棱锥![]() |
B.![]() ![]() |
C.异面直线EF与AG所成的角的余弦值为![]() |
D.过点![]() ![]() ![]() ![]() |
您最近一年使用:0次
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1379次组卷
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5卷引用:广东省深圳市高级中学等九校2022届高三上学期11月联考数学试题
解题方法
6 . 如图,平行六面体
的底面为菱形,且
,
,则下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/11/6/2845466838155264/2847719718338560/STEM/3679315bf3ad4b77a15687ca125df239.png?resizew=295)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52a6ee51af9b52152488b1772fa190fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f688da37e8c00fb06e0bf5d0c59974.png)
![](https://img.xkw.com/dksih/QBM/2021/11/6/2845466838155264/2847719718338560/STEM/3679315bf3ad4b77a15687ca125df239.png?resizew=295)
A.![]() | B.![]() |
C.平面![]() ![]() | D.![]() ![]() ![]() |
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7 . 如图,椭圆Ⅰ与Ⅱ有公共的左顶点和左焦点,且椭圆Ⅱ的右顶点为椭圆Ⅰ的中心.设椭圆Ⅰ与Ⅱ的长半轴长分别为
和
,半焦距分别为
和
,离心率分别为
和
,则下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/11/9/2847485750009856/2848043191943168/STEM/085a95f9c3e541129b348625730a8911.png?resizew=187)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7936359df4c926b72b48c6fdae55f12d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b76f79be89b8c6227b68eded6b675546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33558881906c228c262ff8024dcfc4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a33a99190a8fd29c36d5a002e3197cc5.png)
![](https://img.xkw.com/dksih/QBM/2021/11/9/2847485750009856/2848043191943168/STEM/085a95f9c3e541129b348625730a8911.png?resizew=187)
A.![]() | B.![]() |
C.![]() | D.椭圆Ⅱ比椭圆Ⅰ更扁 |
您最近一年使用:0次
2021-11-11更新
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|
2卷引用:广东省深圳市第七高级中学2021-2022学年高二上学期第二学段考试数学试题
8 . 如图,过椭圆的左右焦点
,
分别作长轴的垂线
,
交椭圆于
,
,
,
,将
,
两侧的椭圆弧删除再分别以
,
为圆心,
,
线段的长度为半径作半圆,这样得到的图形称为“椭圆帽”.夹在
,
之间的部分称为椭圆帽的“帽体段”,夹在
,
两侧的部分称为椭圆帽的“帽檐段”.已知左右两个帽檐段所在的圆方程分别为
.
![](https://img.xkw.com/dksih/QBM/2021/11/9/2847605811953664/2848256579928064/STEM/58116fd3a28145b8a67e72d73440ba92.png?resizew=270)
(1)求“帽体段”的方程;
(2)记“帽体段”所在椭圆为C,过点
的直线与椭圆C交于A,B两点,在x轴上是否存在一个定点
,使得
为定值?若存在,求出M点的坐标;若不存在,说明理由.
![](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/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.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/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a71fc9c0068109dad1382354570665.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](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/353306bd6b4636a4fef978341dff8eda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff3728057a0c8be16bdd2e1c32799e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8725de966d855d6d991e0ea8e70d7.png)
![](https://img.xkw.com/dksih/QBM/2021/11/9/2847605811953664/2848256579928064/STEM/58116fd3a28145b8a67e72d73440ba92.png?resizew=270)
(1)求“帽体段”的方程;
(2)记“帽体段”所在椭圆为C,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c454d7cebb5355b61d71cafb47afd72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d7b5dbef8375f3277cad849af53681f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3cd639d381fb8f5675d8528ef19e0ae.png)
您最近一年使用:0次
2021-11-10更新
|
351次组卷
|
5卷引用:广东省深圳市第七高级中学2021-2022学年高二上学期第二学段考试数学试题
解题方法
9 . 在棱长为
的正方体
中,点
在棱
上,且
.
![](https://img.xkw.com/dksih/QBM/2021/11/6/2845466838155264/2847719718526976/STEM/e1154a0f-c950-4d3a-9f7f-f53c0dc2480b.png?resizew=257)
(1)当
时,求直线
与平面
所成的角的正弦值;
(2)是否存在
,使平面
与平面
的夹角的余弦为
,若存在,求
值,若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fa8438c8fa226e90b13e17bcf8af336.png)
![](https://img.xkw.com/dksih/QBM/2021/11/6/2845466838155264/2847719718526976/STEM/e1154a0f-c950-4d3a-9f7f-f53c0dc2480b.png?resizew=257)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f83464bf17f9d4d9ee6a7f299539871.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
(2)是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bf21323743db36f3a2ea9ce620e9bc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
10 . 已知矩形
满足
,
,点
为
的中点,连接
、
,
交
于点
.将
沿
折起,点
翻折到新的位置
,得到一个四棱锥
.
(1)证明:
平面
;
(2)若平面
平面
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ea0df817e3e2cd95b9cd8f73386834c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a94173bc376094fed682f27d764c8829.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926172e59e9aa32dcccb76340d135c4e.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0edb1508fc95765f3bb316bcb5252d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/628ba1d771ed20ac7389735425c1c4b4.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bb2b2d9193d8288942d7715728f765c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21533755bc8c6cb3a01cdb2ebd5ddf88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76befe029907018828e0a36c30376bfb.png)
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