1 . 如图,四棱锥
中,底面
为平行四边形,
底面
,
是棱
的中点,
且
.
![](https://img.xkw.com/dksih/QBM/2017/9/2/1765395891019776/1766284314329088/STEM/8d6d454cd5a04b7cb0322403aa363d9e.png?resizew=220)
(1)求证:
平面
;
(2)如果
是棱
上一点,且直线
与平面
所成角的正弦值为
,求
的值.
![](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/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/e0629ce42392a7fe9be21d25c39c3e64.png)
且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/890c5b938c7a39a891faeaac4d77aee8.png)
![](https://img.xkw.com/dksih/QBM/2017/9/2/1765395891019776/1766284314329088/STEM/8d6d454cd5a04b7cb0322403aa363d9e.png?resizew=220)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf2f0df53aa68c9c334165034788166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e64e76a4c1e5934f51cdca2ffbc8313f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2d109733379365295b93c58769d2019.png)
您最近一年使用:0次
2016-12-13更新
|
1590次组卷
|
4卷引用:【校级联考】广东省汕头市达濠华侨中学,东厦中学2019届高三上学期第三次联考数学(理)试题
2 . 如图,正方体
的棱长为
,
分别为
的中点.
(1)求证:
;
(2)求二面角
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d52429789f22fe9061973e123a038d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03f5572d9521e112be8148fea4d7241f.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16155b0c208b346e93529385c8793b49.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e74534a54d7271e1b95fd3a74121468b.png)
![](https://img.xkw.com/dksih/QBM/2017/2/16/1625334186016768/1632305636458496/STEM/3ef8953362d0463789f94b1d9d73efde.png?resizew=218)
您最近一年使用:0次
2017-02-26更新
|
473次组卷
|
2卷引用:2016-2017学年广东省珠海市高一上学期期末考试B数学试卷
3 . 如图,在四棱锥
中,
平面
,底面
是菱形,
,
为
与
的交点,
为
上任意一点.
(1)证明:平面
平面
;
(2)若
平面
,并且二面角
的大小为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b86db010859f7a243badec02946a4e24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/677d1863ff4d8ac1604b18149d4f320f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36222db36e348661eb5f616820e4e60f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca48c18021e7be4bbb3e95576e1c1b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/306681bd5aaa51e9c63ab3002e23dec5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ccfd81d120348601cd611241d1a5dc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af53bde2b93b4707c79d00010ac9ff06.png)
![](https://img.xkw.com/dksih/QBM/2018/3/25/1909534314594304/1912476343926784/STEM/d7f94517aeb34b6b99a53db8b1b90065.png?resizew=164)
您最近一年使用:0次
2016-12-03更新
|
17次组卷
|
4卷引用:2015届广东省汕头市潮南区高三高考模拟二理科数学试卷
4 . 如图,在三棱锥
中,
,∠ACB=90°,侧面
为等边三角形,侧棱
.
![](https://img.xkw.com/dksih/QBM/2016/8/3/1572950095380480/1572950101630976/STEM/864aba4443da435d9f7ef0f795ef21bf.png?resizew=192)
(Ⅰ)求证:
;
(Ⅱ)求证:平面PAB⊥平面
;
(Ⅲ)求二面角
的余弦值.
![](https://img.xkw.com/dksih/QBM/2016/8/3/1572950095380480/1572950101630976/STEM/51cff678414d4c2ead3da54d7ead8c87.png?resizew=60)
![](https://img.xkw.com/dksih/QBM/2016/8/3/1572950095380480/1572950101630976/STEM/b955bbc11e174293b12f5ea8a6b349c7.png?resizew=95)
![](https://img.xkw.com/dksih/QBM/2016/8/3/1572950095380480/1572950101630976/STEM/cf7607dbc8d3463f84a9d239460a264f.png?resizew=35)
![](https://img.xkw.com/dksih/QBM/2016/8/3/1572950095380480/1572950101630976/STEM/07a320938e9a4c278854a6ad4dd82ee7.png?resizew=73)
![](https://img.xkw.com/dksih/QBM/2016/8/3/1572950095380480/1572950101630976/STEM/864aba4443da435d9f7ef0f795ef21bf.png?resizew=192)
(Ⅰ)求证:
![](https://img.xkw.com/dksih/QBM/2016/8/3/1572950095380480/1572950101630976/STEM/ddaef9387bb74310a296a8b9ed59fe67.png?resizew=62)
(Ⅱ)求证:平面PAB⊥平面
![](https://img.xkw.com/dksih/QBM/2016/8/3/1572950095380480/1572950101630976/STEM/2536f3feeab34ea79d0179f1db96b3b7.png?resizew=37)
(Ⅲ)求二面角
![](https://img.xkw.com/dksih/QBM/2016/8/3/1572950095380480/1572950101630976/STEM/bcb965000a0d49a1b96e78b91ee56675.png?resizew=74)
您最近一年使用:0次
5 . 如图所示,四边形ABCD是菱形,O是AC与BD的交点,
.
![](https://img.xkw.com/dksih/QBM/2016/4/22/1572601921355776/1572601927516160/STEM/c129d8b508a943ed98166f35c2da04e1.png)
(Ⅰ)求证:
;
(Ⅱ)若
,
, AB=2,求SO的长及点A到平面SBD的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/553c3cdaf0945114985729d0bd7f3ddf.png)
![](https://img.xkw.com/dksih/QBM/2016/4/22/1572601921355776/1572601927516160/STEM/c129d8b508a943ed98166f35c2da04e1.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a5c692979ef9a21a433e049dae4682.png)
(Ⅱ)若
![](https://img.xkw.com/dksih/QBM/2016/4/22/1572601921355776/1572601927516160/STEM/5488eb3558ba4515993834d76fa41114.png)
![](https://img.xkw.com/dksih/QBM/2016/4/22/1572601921355776/1572601927516160/STEM/95759d467f3c4b149ef978a19b5bdc57.png)
您最近一年使用:0次
6 . 在五棱锥P﹣ABCDE中,PA=AB=AE=2a,PB=PE=2
a,BC=DE=a,∠EAB=∠ABC=∠DEA=90°
![](https://img.xkw.com/dksih/QBM/2016/3/23/1572554505527296/1572554511417344/STEM/fdc4242ad124478a89293f88b1d33b8f.png)
(1)求证:PA⊥平面ABCDE;
(2)求二面角A﹣PD﹣E的正弦值.
![](https://img.xkw.com/dksih/QBM/2016/3/23/1572554505527296/1572554511417344/STEM/54ce5c40c56b4ccba04297b2dcbf474d.png)
![](https://img.xkw.com/dksih/QBM/2016/3/23/1572554505527296/1572554511417344/STEM/fdc4242ad124478a89293f88b1d33b8f.png)
(1)求证:PA⊥平面ABCDE;
(2)求二面角A﹣PD﹣E的正弦值.
您最近一年使用:0次
2016-12-04更新
|
373次组卷
|
2卷引用:2015-2016学年广东省实验中学高二上学期期末理科数学试卷
7 . 如图,ABCD是块矩形硬纸板,其中AB=2AD,AD=
,E为DC的中点,将它沿AE折成直二面角D-AE-B.
![](https://img.xkw.com/dksih/QBM/2016/3/22/1572553729376256/1572553735413760/STEM/45313a1eefc1407badfc7615c651e5ae.png)
(1)求证:AD⊥平面BDE;
(2)求二面角B-AD-E的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2016/3/22/1572553729376256/1572553735413760/STEM/45313a1eefc1407badfc7615c651e5ae.png)
(1)求证:AD⊥平面BDE;
(2)求二面角B-AD-E的余弦值.
您最近一年使用:0次
2016-12-04更新
|
498次组卷
|
2卷引用:2016-2017学年广东省仲元中学高二上学期期末考试数学(理)试卷
8 . 如图,在直三棱柱ABC-A1B1C1中,
,点E、F、G分别是AA1、AC、BB1的中点,且CG⊥C1G.
![](https://img.xkw.com/dksih/QBM/2016/2/26/1572500601774080/1572500607582208/STEM/3a36b77999f041fc8e6a3f7688599870.png)
(1)求证:CG//面BEF;
(2)求证:面BEF⊥面A1C1G.
![](https://img.xkw.com/dksih/QBM/2016/2/26/1572500601774080/1572500607582208/STEM/0317b8fb26364973a26b6eb5ccab664e.png)
![](https://img.xkw.com/dksih/QBM/2016/2/26/1572500601774080/1572500607582208/STEM/3a36b77999f041fc8e6a3f7688599870.png)
(1)求证:CG//面BEF;
(2)求证:面BEF⊥面A1C1G.
您最近一年使用:0次
9 . 在正三棱锥
中,
、
分别为棱
、
的中点,且
.
![](https://img.xkw.com/dksih/QBM/2015/9/11/1572229475041280/1572229480955904/STEM/2ba52750b4c54f94a53a9e5ead3d1cd2.png)
(1)求证:直线
平面
;
(2)求证:平面
平面
.
![](https://img.xkw.com/dksih/QBM/2015/9/11/1572229475041280/1572229480955904/STEM/06a1a2bd819a44c982a525ad6cde88df.png)
![](https://img.xkw.com/dksih/QBM/2015/9/11/1572229475041280/1572229480955904/STEM/31e6e0f27e9e48be86cebe33864a9223.png)
![](https://img.xkw.com/dksih/QBM/2015/9/11/1572229475041280/1572229480955904/STEM/41469a49c14b4de586c547ff8df8bc98.png)
![](https://img.xkw.com/dksih/QBM/2015/9/11/1572229475041280/1572229480955904/STEM/940335b942964da888138fc6690f4f5a.png)
![](https://img.xkw.com/dksih/QBM/2015/9/11/1572229475041280/1572229480955904/STEM/960ff362f8da4645bd3dcf59ad26abee.png)
![](https://img.xkw.com/dksih/QBM/2015/9/11/1572229475041280/1572229480955904/STEM/b106e917b59340c384ebd38015c24826.png)
![](https://img.xkw.com/dksih/QBM/2015/9/11/1572229475041280/1572229480955904/STEM/2ba52750b4c54f94a53a9e5ead3d1cd2.png)
(1)求证:直线
![](https://img.xkw.com/dksih/QBM/2015/9/11/1572229475041280/1572229480955904/STEM/f38c6affd7034c46b6e7384380ce8c91.png)
![](https://img.xkw.com/dksih/QBM/2015/9/11/1572229475041280/1572229480955904/STEM/34c371fb18144b0ba07dda89b61665c3.png)
(2)求证:平面
![](https://img.xkw.com/dksih/QBM/2015/9/11/1572229475041280/1572229480955904/STEM/0721aeca5f464bd3ac7c553fde9eb777.png)
![](https://img.xkw.com/dksih/QBM/2015/9/11/1572229475041280/1572229480955904/STEM/f29f0ced562b4449b8ecd08a228540fe.png)
您最近一年使用:0次
10 . 如图,空间四边形ABCD中,
,
,
分别是AB,BC,CD的中点,求证:
![](https://img.xkw.com/dksih/QBM/2015/8/14/1572214065676288/1572214071500800/STEM/d9a0ed54d4b04d87aad1b69eabcc3966.png)
(1)AC∥平面
;
(2)BD∥平面
.
![](https://img.xkw.com/dksih/QBM/2015/8/14/1572214065676288/1572214071500800/STEM/626a80080fec4f7cb6214724161f3531.png)
![](https://img.xkw.com/dksih/QBM/2015/8/14/1572214065676288/1572214071500800/STEM/a91ad33ea4aa428f8ceb12305cd207ca.png)
![](https://img.xkw.com/dksih/QBM/2015/8/14/1572214065676288/1572214071500800/STEM/59a2cb39baa64285a2fe43bbc21a8608.png)
![](https://img.xkw.com/dksih/QBM/2015/8/14/1572214065676288/1572214071500800/STEM/d9a0ed54d4b04d87aad1b69eabcc3966.png)
(1)AC∥平面
![](https://img.xkw.com/dksih/QBM/2015/8/14/1572214065676288/1572214071500800/STEM/0afbdbf470f24626b0f8c80a7021e4b1.png)
(2)BD∥平面
![](https://img.xkw.com/dksih/QBM/2015/8/14/1572214065676288/1572214071500800/STEM/0afbdbf470f24626b0f8c80a7021e4b1.png)
您最近一年使用:0次