1 . 已知直三棱柱
中,
,
,点
在
上.
![](https://img.xkw.com/dksih/QBM/2012/2/17/1570749145415680/1570749151059968/STEM/a81513e327084bfb948597778b07938f.png?resizew=196)
(1)若
是
中点,求证:
∥平面
;
(2)当
时,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27bdc079ac48bb2601a3ca5cd8694adf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2012/2/17/1570749145415680/1570749151059968/STEM/a81513e327084bfb948597778b07938f.png?resizew=196)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62fd0b510920be6bc60d170c3ff3da3.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bbac29a17b33470bdd57815a96fb1fe.png)
![](https://img.xkw.com/dksih/QBM/2012/2/17/1570749145415680/1570749151059968/STEM/26601e0d377b46399d4a4a39a60d36d2.png?resizew=79)
您最近一年使用:0次
2016-12-01更新
|
563次组卷
|
3卷引用:2015届河南省濮阳市高三上学期期末摸底考试理科数学试卷
2 . 如图,在四棱柱
中,侧面
⊥底面
,
,底面
为直角梯形,其中![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a44bcd34c14a1300d5827573f2fa30b7.png)
,O为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/13/cdb2c213-d69f-45a7-bb3a-b21c12275e48.png?resizew=244)
(Ⅰ)求证:
平面
;
(Ⅱ)求锐二面角A—C1D1—C的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d540455054b9781297a1e871949be43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a44bcd34c14a1300d5827573f2fa30b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04a93f5289c1483bc39b0125fdc8dd67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/13/cdb2c213-d69f-45a7-bb3a-b21c12275e48.png?resizew=244)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e6dcab5d5bdeb695b261e21c8491039.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a211ad5a06b505b8365a62c1946f3cb7.png)
(Ⅱ)求锐二面角A—C1D1—C的余弦值.
您最近一年使用:0次
2016-12-01更新
|
1196次组卷
|
8卷引用:2012届河南省卢氏一高高三上学期期末调研考试理科数学试卷
(已下线)2012届河南省卢氏一高高三上学期期末调研考试理科数学试卷(已下线)2012届山东省济南一中高三上学期期末理科数学试卷(已下线)2011届江西省宜春市高三模拟考试数学理卷2015届湖北省襄阳市第五中学高三第一学期11月质检理科数学试卷2016届山东省枣庄八中高三12月月考理科数学试卷2016-2017学年河北冀州中学高二理上期中考试数学卷2017届广东顺德李兆基中学高三理上月考二数学试卷广西南宁市第二中学2019-2020学年高二上学期期中考试(理)数学试题
3 . 如图,四边形
为矩形,四边形
为梯形,平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5bf51c07144386bd23a422d9ceb140.png)
平面
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/789d408be5c0e9871e844f9b2a824c1b.png)
.![](https://img.xkw.com/dksih/QBM/2011/7/12/1570254434484224/1570254439505920/STEM/ef9ce7def3244ade8e414d31f683fbda.png?resizew=224)
(Ⅰ)若
为
中点,求证:
平面
;
(Ⅱ)求平面
与平面
所成锐二面角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5bf51c07144386bd23a422d9ceb140.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5bf51c07144386bd23a422d9ceb140.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/789d408be5c0e9871e844f9b2a824c1b.png)
.
![](https://img.xkw.com/dksih/QBM/2011/7/12/1570254434484224/1570254439505920/STEM/ef9ce7def3244ade8e414d31f683fbda.png?resizew=224)
(Ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81fa367ec317fe2a30142e1c30cce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df21b7b7a47318ef2bb069450c39f1cd.png)
(Ⅱ)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
您最近一年使用:0次
11-12高三上·河南洛阳·期末
4 . 已知四棱锥
的底面是直角梯形,
,
为
中点,
与
交于
点,
,
平面
.
![](https://img.xkw.com/dksih/QBM/2011/5/19/1570209865703424/1570209870864384/STEM/f197539eb3054ea0ac43e0cad3ee2305.png?resizew=150)
(1)求证:
;
(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/925fc6d18820c1acb6bb6b850eaa1f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.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/19f779e7f5f53e4377b9a0a8e945d562.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2011/5/19/1570209865703424/1570209870864384/STEM/f197539eb3054ea0ac43e0cad3ee2305.png?resizew=150)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0180a58a753fced571fc00f0bee8ff0d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad34a6f7519ad2d32a92812587bc72a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a49de08c6527101927582945d6551bf.png)
您最近一年使用:0次
11-12高二上·河南许昌·期末
5 . 如图,四棱锥
的底面是边长为1的正方形,
底面
,
.
![](https://img.xkw.com/dksih/QBM/2011/3/16/1570041965641728/1570041971179520/STEM/7858b438fa4c41bdb97d1488384326db.png?resizew=240)
(Ⅰ)求面
与面
所成二面角的大小;
(Ⅱ)设棱
的中点为
,求异面直线
与
所成角的大小;
(Ⅲ)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb2e071d4e01107dcf7d95cbb86b415.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/726cbc071876f2a0f8218945347e5158.png)
![](https://img.xkw.com/dksih/QBM/2011/3/16/1570041965641728/1570041971179520/STEM/7858b438fa4c41bdb97d1488384326db.png?resizew=240)
(Ⅰ)求面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26ca000cd3c0e285cb4acf011802041.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c9bb0dbeeeaae4017b05aeb77dcf99e.png)
(Ⅱ)设棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6e2867f32d3f1c3cd36cd3a11a8580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4db9b82b67efe45a02fca32bfcf5dc.png)
(Ⅲ)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21665d21bbfb04410c78345de1fd15ae.png)
您最近一年使用:0次
11-12高二上·河南许昌·期末
6 . 设
,求直线AD与平面
的夹角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26f840a8bca77d1f77a03c9344f0926.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
7 . 如图,在直三棱柱ABC—A1B1C1中,AC=1,AB=
,BC=
,AA1=
.
(I)求证:A1B⊥B1C;
(II)求二面角A1—B1C—B的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(I)求证:A1B⊥B1C;
(II)求二面角A1—B1C—B的大小.
![](https://img.xkw.com/dksih/QBM/2011/3/1/1570020705312768/1570020710359040/STEM/d4547a95c8d64b1ca594052f3f345473.png?resizew=161)
您最近一年使用:0次
2010·四川成都·一模
8 . 如图一,平面四边形
关于直线
对称,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eaa1c93a6352ed24e16f4e408b0209b.png)
.
把
沿
折起(如图二),使二面角
的余弦值等于
.对于图二,
(Ⅰ)求
;(Ⅱ)证明:
平面
;
(Ⅲ)求直线
与平面
所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/2012/1/3/1570675446882304/1570675452485632/STEM/316b4a8d6e114661958a8475137b7190.png)
![](https://img.xkw.com/dksih/QBM/2012/1/3/1570675446882304/1570675452485632/STEM/fd0cf25aefca4039a6bd71585881342e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eaa1c93a6352ed24e16f4e408b0209b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
把
![](https://img.xkw.com/dksih/QBM/2012/1/3/1570675446882304/1570675452485632/STEM/9a8639e6294041e3a607d4125cfdfea1.png)
![](https://img.xkw.com/dksih/QBM/2012/1/3/1570675446882304/1570675452485632/STEM/344a6db68fde4b8e8b55927a4b6252f7.png)
![](https://img.xkw.com/dksih/QBM/2012/1/3/1570675446882304/1570675452485632/STEM/c2b54336d6f64c46a2b475104ebdccef.png)
![](https://img.xkw.com/dksih/QBM/2012/1/3/1570675446882304/1570675452485632/STEM/72fafdca3d4642aeb6ac09c104b8a7ba.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2012/1/3/1570675446882304/1570675452485632/STEM/e4187f547af344449a79e8eda288e647.png)
![](https://img.xkw.com/dksih/QBM/2012/1/3/1570675446882304/1570675452485632/STEM/ade6e06fec07407a851fdce4de7d8bf3.png)
(Ⅲ)求直线
![](https://img.xkw.com/dksih/QBM/2012/1/3/1570675446882304/1570675452485632/STEM/fd0cf25aefca4039a6bd71585881342e.png)
![](https://img.xkw.com/dksih/QBM/2012/1/3/1570675446882304/1570675452485632/STEM/01787e4bdba94c61bef24e927a7f4ace.png)
![](https://img.xkw.com/dksih/QBM/2012/1/3/1570675446882304/1570675452485632/STEM/c6384ee551494e1a9ba9a3ef6eea35d1.png)
您最近一年使用:0次
10-11高三上·四川乐山·阶段练习
9 . 如图,在四棱锥
中,底面
是矩形,
、
分别为
、
的中点,
平面
,且
,
.
(1)证明:
平面
;
(2)证明:
;
(3)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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/bf5c6dd40389c33604683d88d2a10853.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a10ec513600c19b4bd140ce3da17355.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c5651e38293e0c42a7278af69fa53ae.png)
![](https://img.xkw.com/dksih/QBM/2010/11/12/1569898757816320/1569898763198464/STEM/5c64e845e6e943d48a4ea04b39a5a32d.png?resizew=248)
您最近一年使用:0次
9-10高三·福建厦门·阶段练习
名校
10 . 如图,四棱锥P—ABCD的底面ABCD是正方形,侧棱PD⊥底面ABCD,PD=DC,E是PC的中点.
![](https://img.xkw.com/dksih/QBM/2010/10/13/1569852155854848/1569852160901120/STEM/663cc1cc6f6d4680ab08f50a8af25719.png?resizew=182)
(Ⅰ)证明PA//平面BDE;
(Ⅱ)求二面角B—DE—C的平面角的余弦值;
(Ⅲ)在棱PB上是否存在点F,使PB⊥平面DEF?证明你的结论.
![](https://img.xkw.com/dksih/QBM/2010/10/13/1569852155854848/1569852160901120/STEM/663cc1cc6f6d4680ab08f50a8af25719.png?resizew=182)
(Ⅰ)证明PA//平面BDE;
(Ⅱ)求二面角B—DE—C的平面角的余弦值;
(Ⅲ)在棱PB上是否存在点F,使PB⊥平面DEF?证明你的结论.
您最近一年使用:0次
2016-11-30更新
|
1638次组卷
|
7卷引用:2012届河南省南阳市高三上学期期终质量评估理科数学
(已下线)2012届河南省南阳市高三上学期期终质量评估理科数学2015-2016学年河南省南阳市高二上学期期末理科数学试卷(已下线)2011届福建省厦门双十中学高三第一次月考理科数学卷(已下线)2013-2014学年江西宜春上高二中高二第六次月考理数学卷浙江省温州市瑞安市瑞安中学2018-2019学年高二下学期期中数学试题陕西省咸阳市实验中学2019-2020学年高一上学期第三次月考数学试题陕西省咸阳市泾阳县泾干中学2020-2021学年高一上学期第五次月考数学试题