名校
解题方法
1 . 如图,在
中,
,
,
面BCD,
,E,F分别是AC,AD上的动点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/7f2e5775-356a-4f6f-a014-cef0adb8d08c.png?resizew=134)
(1)求证:
平面ABC;
(2)是否存在
,使得平面
面ACD?如果存在,求出
的值并求此时面BEF分三棱锥
得到的上下两部分几何体体积之比;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3bbe4cdd2c154bd9a8073b0d4cecb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e921f46d90e43f4517c55832b6280f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a690535ef8766d108cce93b9e8544311.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0f8c3919c43bdd4e8ecbbde71704313.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/7f2e5775-356a-4f6f-a014-cef0adb8d08c.png?resizew=134)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5f445af1ae136773cb338920552ff2.png)
(2)是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e51838e395dfc9d9ef597d9e01f46272.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
您最近一年使用:0次
名校
解题方法
2 . 如图,在棱长为2的正方体
中,
为
中点,
为
中点,
为
上一点,
,
为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/d1cf3353-d686-4a8c-8bf5-c52b19b23170.png?resizew=176)
(1)证明:
平面
;
(2)求四面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b29ec91f3667ac4e509a466060a8baf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/d1cf3353-d686-4a8c-8bf5-c52b19b23170.png?resizew=176)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51ca6d6dcda56b12ec23bbff8fbed1f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e06947327f4c41340b8713e8a6b4c87.png)
(2)求四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3db47ff3da4b81248e7c36004874623.png)
您最近一年使用:0次
2020-02-14更新
|
271次组卷
|
3卷引用:2019届重庆市普通高等学校招生全国统一考试4月(二诊)调研测试(康德版)(文科)数学试题
3 . 如图,在正三棱柱ABC﹣A1B1C1中,D为AB的中点,E为棱BB1上一点,且
.
(1)在下列两个问题中任选一个作答,如果两个都作答,则按第一个解答计分.
①证明:AE⊥平面A1CD;
②证明:BC1∥平面A1CD.
(2)若AB=2,AA1=3,求二面角A1﹣BC1﹣C的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adad77d896c9ac008a6832f10079ec2e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/9ac00619-ba16-468b-aade-cd30129d0194.png?resizew=157)
(1)在下列两个问题中任选一个作答,如果两个都作答,则按第一个解答计分.
①证明:AE⊥平面A1CD;
②证明:BC1∥平面A1CD.
(2)若AB=2,AA1=3,求二面角A1﹣BC1﹣C的余弦值.
您最近一年使用:0次
2020-07-23更新
|
464次组卷
|
3卷引用:重庆市渝西九校2020届高三(5月份)高考数学(理科)联考试题
4 . 如图,三棱柱
中,
平面
,
,
,
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/2020/7/16/2507040593838080/2507372792176640/STEM/37e29c1e4a974785aed0c72a0894dd49.png?resizew=121)
(1)证明:
平面
;
(2)若直线
与平面
所成角为
,求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://img.xkw.com/dksih/QBM/2020/7/16/2507040593838080/2507372792176640/STEM/37e29c1e4a974785aed0c72a0894dd49.png?resizew=121)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9df77527db5d65c2f4a0e7d308a52530.png)
您最近一年使用:0次
5 . 如图,在三棱台
中,已知
两两互相垂直,点
为
的中点,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/e5908ddf-cd25-4837-bd2d-e45903fc6a39.png?resizew=230)
(1)求证:
平面
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c674f6129c22ef714c8e873d1013747d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf627980d698b83220a26bca1919fdfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a39cba64c3aa3d36d6b8957873fcf125.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/e5908ddf-cd25-4837-bd2d-e45903fc6a39.png?resizew=230)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/565133e91e3ace2b2187cfc6f1db5be6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea848cd2aa3a464618020475097949fc.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dddfef906818cc8ddd00f867b77f227.png)
您最近一年使用:0次
6 . 如图,三棱柱
中,
.
(1)求证:
为等腰三角形;
(2)若平面
平面
,且
,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/529f79668593481345e1c88de5438184.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63fb41a06d30ae3ffb3cc7bbfe10eb49.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c7eb3e9d430fc71327fdaea5896f41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4908fad3dc6fe1b0675c870328f043ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20e86ed7c860e16dba7e3f557cb32d6a.png)
![](https://img.xkw.com/dksih/QBM/2018/5/14/1945351344832512/1947380381065216/STEM/c214f55c10e4423780aee08e6edd668b.png?resizew=212)
您最近一年使用:0次
解题方法
7 . 如图,在三棱柱
中,
,
平面
,侧面
是正方形,点
为棱
的中点,点
、
分别在棱
、
上,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/ab876ec5-8e30-421b-b322-2e45227130f5.png?resizew=193)
(1)证明:平面
平面
;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ee6a2c9d3843855bf89516bdd6ad5de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/865202308750f48ff8fadc6dcf4c5c59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5208b1c9d46645f810974195015884a8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/ab876ec5-8e30-421b-b322-2e45227130f5.png?resizew=193)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9f9bab9ec616f69811e860d0f0dca5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e535c4e789055c7c184b5bef72ab249.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2df117cb4c42e0e8e4daa273c39e93cd.png)
您最近一年使用:0次
2018-04-13更新
|
503次组卷
|
2卷引用:重庆市2018届高三4月调研测试(二诊)数学理试题
解题方法
8 . 如图,三棱柱
中,
分别为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/12/5083663d-1cb1-4228-b690-5047b92c0628.png?resizew=228)
(1)求证:
平面
;
(2)若
,平面
平面
,求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4dfea6353fc25e88535e865a4982cb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/12/5083663d-1cb1-4228-b690-5047b92c0628.png?resizew=228)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee5c0ab878cc4101575c479dad1b5a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba96e2f75ae659e366adfd6972660c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70db40c42655327adee01caedfc9d50c.png)
您最近一年使用:0次
2016-12-04更新
|
484次组卷
|
4卷引用:2016届重庆市一中高三下学期模拟文科数学试卷
9 . 如图所示的几何体中,
为三棱柱,且
平面
,四边形
为平行四边形,
,
.
(1)若
,求证:
平面
;
(2)若
,
,二面角
的余弦值为
,求三棱锥
的体积.
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572857765330944/1572857771720704/STEM/edd5ecfd6b734c19969eebb2244be837.png?resizew=176)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42b730d87bb95763a48c69f1b0329ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a58a622e2b1a239f2f96aa1501e9799.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46fe926770d2354e172dec02f5ce2efe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d1d2e0f281222a5f289ea4008370aed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb04914c4e8fb3483da44c67fe1809f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb8b7dbd627b58c8b75edb37a61a5e15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d027be176d18651cfd30f5492789ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dcecfc88e45465b7e2215a8557148da.png)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572857765330944/1572857771720704/STEM/edd5ecfd6b734c19969eebb2244be837.png?resizew=176)
您最近一年使用:0次
10 . 如图4,四边形
为正方形,
平面
,
,
于点
,
,交
于点
.
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/728dd7fac41e469ff3e1a1dbe59fb50c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f392902d611863c6908a48e696e7bd8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdd3699fbb7a8ba3f792cceb24719f71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac0b72906641ed13716cfbce50923282.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa3254460ecbacecb3e57c5dce227f4.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9726261c25e7086835912c0d4815d270.png)
您最近一年使用:0次
2016-12-03更新
|
5393次组卷
|
8卷引用:【全国校级联考】重庆市合川区高2018届高三下5月模拟理科数学试题
【全国校级联考】重庆市合川区高2018届高三下5月模拟理科数学试题2014年全国普通高等学校招生统一考试理科数学(广东卷)2016届宁夏石嘴山三中高三上学期期末考试理科数学试卷陕西省师范大学附属中学2017-2018学年高二上学期期中考试数学(理)试题(已下线)专题24 空间向量与空间角的计算-十年(2011-2020)高考真题数学分项陕西省西安市长安区第一中学2024届高三上学期期中数学(理)试题宁夏石嘴山三中2016届高三(上)期末数学试卷(理科)(解析版)(已下线)专题23 立体几何解答题(理科)-2