1 . 如图,在四棱锥
中,
平面
,底面
是菱形,
,
,
,
分别是棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/2c3ae9c9-ad07-48d8-b6a2-648bae048570.png?resizew=208)
(1)证明:
平面
;
(2)求二面角
的余弦值.
![](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/7bb8fb552b9e21dbaba74d11aa747790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6184f3b929dda3c1b3b35b9aec448118.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47891397990336f55f96bd66d367758b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/2c3ae9c9-ad07-48d8-b6a2-648bae048570.png?resizew=208)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/053af8641980763a7f0e77beefe0712d.png)
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2 . 已知双曲线
,则
的渐近线方程为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05ee700ae61a7ca6dd3881ed05ea34d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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2019-08-23更新
|
647次组卷
|
4卷引用:云南省昆明市2018-2019学年高二下学期期末考试数学(文)试题
3 . 过原点的直线l与圆
相交所得的弦长为
,则直线l的斜率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c36518ec2ebf9f2ac07e808ebb08d4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bb57575dea540c569265de158429425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
A.2 | B.1 | C.![]() | D.![]() |
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4 . 函数
的图象在点
处的切线方程为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d68a1bf675a2fd319cbf6590bb4abb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81158db42116f74e7b26e100f88dd535.png)
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5 . 在直角坐标系
中,圆C的方程为
,以
为极点,
轴的非负半轴为极轴建立极坐标系.
(1)求圆C的极坐标方程;
(2)直线
的极坐标方程是
,射 线
与圆C的交点为
,与直线
的交点为
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b63af296fafc50c28e75e34bee1f9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)求圆C的极坐标方程;
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f35bb33cd5c1c8d9215bf3c7e1d54af9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6965aa31edc12aa52c789509f134c9af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2db36b4497b911bc047253b832ae01c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
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2019-09-15更新
|
467次组卷
|
5卷引用:山西省应县第一中学校2018-2019学年高二下学期期末考试数学(理)试题
6 . 已知
是以
为直径的半圆弧上的动点,
为圆心,
为
中点,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10908218148af79fd79ec92061652af3.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10908218148af79fd79ec92061652af3.png)
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7 . 设
,则下列正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/326767f6b6552cd62e135fbe15a1b271.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
8 . 把3名辅导老师与6名学生分成3个小组(每组1名教师,2名学生)开展实验活动,但学生甲必须与教师A在一起,这样的分组方法有________ 种.(用数字作答)
您最近一年使用:0次
2019-09-15更新
|
355次组卷
|
2卷引用:山西省应县第一中学校2018-2019学年高二下学期期末考试数学(理)试题
9 . 把4个苹果分给两个人,每人至少一个,不同分法种数有( )
A.6 | B.12 | C.14 | D.16 |
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