1 . 如图所示,在四棱锥
中,
是边长为2的正方形,且
,且
.
![](https://img.xkw.com/dksih/QBM/2017/2/5/1619482427441152/1619482427965440/STEM/e3dccc4a140e4859a6304e9c456f4726.png)
(1)求证:
;
(2)求点
到平面
的距离.
![](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/6ce09017ceba47ef27ec67b39e7164b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cf14bc3bfe884ddfff067ba7f410b31.png)
![](https://img.xkw.com/dksih/QBM/2017/2/5/1619482427441152/1619482427965440/STEM/e3dccc4a140e4859a6304e9c456f4726.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac7d8951b216e867fd766ede779d8e4.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
您最近一年使用:0次
2 . 如图所示,四棱锥
的底面是一个直角梯形,
,
平面
,
为
的中点,
.
![](https://img.xkw.com/dksih/QBM/2017/2/2/1619475965157376/1619475965648896/STEM/d4eb90f6676847ff9a8a342d90336dc7.png)
(1)证明:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7b5ea5627440c19999a9039eaa1c06.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92450d1bffea6ff83011c12936812793.png)
![](https://img.xkw.com/dksih/QBM/2017/2/2/1619475965157376/1619475965648896/STEM/d4eb90f6676847ff9a8a342d90336dc7.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ba8f7af0e091e082100c3cd7f8c487f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8ca90486f5edcf87de3cd818fc9189a.png)
您最近一年使用:0次
3 . 如图所示,边长为2的正三角形
所在平面与梯形
所在平面垂直,
,
,
,
为棱
的中点.
![](https://img.xkw.com/dksih/QBM/2017/6/4/1701857123196928/1702189944438784/STEM/61faa430c6594973bab27d5c219e3cb3.png?resizew=233)
(1)求证:直线
平面
;
(2)求三棱锥
的体积..
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3dc3d90beb344a2a154a90009b51bcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15164f8cfc92ef0bff64cc07d9116cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2ea9d3df7c2bcdf135dedd1554fb82b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/2017/6/4/1701857123196928/1702189944438784/STEM/61faa430c6594973bab27d5c219e3cb3.png?resizew=233)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14eec658f69c267a70c1e8f9b744e282.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8909f35376069268f43c3fd8613cf24f.png)
您最近一年使用:0次
4 . 如图,在四棱锥
中,底面
是直角梯形,
底面
,
是
上的点.
![](https://img.xkw.com/dksih/QBM/2016/10/25/1573094198394880/1573094204432384/STEM/802469af15d246c3bdb0353fbc549438.png)
(1)求证:
平面
;
(2)设
,若
是
的中点,且直线
与平面
所成角的正弦值为
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6153163fecdf3f410411048428ccaef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62aa74b442b3374bf2b2b7db0257e8e.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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2016/10/25/1573094198394880/1573094204432384/STEM/802469af15d246c3bdb0353fbc549438.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f3f3cd7dc815e9baf79d40119a9498d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa608b9e7d1bb2a16299ac12fff3e114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/466fabcaac59132fea648ff35342ec9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36d74ef32584586ec4857acd0a3f4fe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8d31e4ac95faeb006d12e2f3776228.png)
您最近一年使用:0次
5 . 在平面直角坐标系xOy中,设命题p:椭圆C:
的焦点在
轴上:命题
直线
与圆
有公共点.若命题
、命题
中有且只有一个为真命题,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6e423ad714d337a7a2135ed34359fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba61bb1a5f689b6f247d2c01d35e1c6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1243e97232811d82a3182785366fa1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a572ee7a7b9201802cc17a8f3632c465.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次