名校
1 . 如图,在直四棱柱ABCD﹣A1B1C1D1中,底面ABCD是矩形,A1D与AD1交于点E,AA1=AD=2AB=4.
![](https://img.xkw.com/dksih/QBM/2020/6/23/2490673496473600/2490894562910208/STEM/0d3c58b69ef64ca7aca195268bce2a5d.png?resizew=178)
(1)证明:AE⊥平面ECD.
(2)求直线A1C与平面EAC所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/2020/6/23/2490673496473600/2490894562910208/STEM/0d3c58b69ef64ca7aca195268bce2a5d.png?resizew=178)
(1)证明:AE⊥平面ECD.
(2)求直线A1C与平面EAC所成角的正弦值.
您最近一年使用:0次
2020-06-23更新
|
685次组卷
|
14卷引用:湖北省金字三角2019-2020学年高三下学期3月线上联考理科数学试题
湖北省金字三角2019-2020学年高三下学期3月线上联考理科数学试题湖北省金字三角2020届高三下学期高考模拟理科数学试题【省级联考】甘肃省、青海省、宁夏回族自治区2019届高三5月联考数学(理)试题湖南省益阳市桃江县第一中学2019届高三5月模拟考试理科数学试题吉林省五地六校联考2019届高三考前适应卷数学文科试题甘、青、宁2019届高三5月联考数学(理)试题【校级联考】吉林省五地六校联考2019届高三考前适应卷数学理科试题陕西省渭南市富平县富平中学2019-2020年高三上学期第一次摸底考试数学(理)试题安徽省凤阳县第二中学2019-2020学年高二上学期期末考试数学(理)试题甘肃省白银市靖远县2018-2019学年高三最后一次联考数学理科试题(已下线)强化卷04(3月)-冲刺2020高考数学之少丢分题目强化卷(山东专版)四川省泸州市泸县第五中学2019-2020学年高三下学期第二次月考数学(文)试题2020届陕西省渭南市高三下学期第二次教学质量检测数学(理)试题辽宁省抚顺市第一中学2020届高三第二次模拟考试数学(理科)试题
解题方法
2 . 如图所示,四棱锥
的底面
是直角梯形,
,
,
,
底面
,过
的平面交
于
,交
于
(
与
不重合).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/d521e82e-7bac-482b-b27a-e2b62e7eee99.png?resizew=161)
(1)求证:
;
(2)若
,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/ae1e04eeb4de72e5750dae77bcb6f88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78aafccd397e9c88a567abf4993d40f.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/d521e82e-7bac-482b-b27a-e2b62e7eee99.png?resizew=161)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6992555878dbb49a22e02435d3072b74.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d3f843b83e62bab294988a7ea134a63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1d4bea28498402f5ca8057d0aaee001.png)
您最近一年使用:0次
解题方法
3 . 在四棱锥
中,
为等边三角形,四边形
为矩形,
为
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/e1bd9ede-d661-4b03-9618-561c796b196d.png?resizew=154)
证明:平面
平面
.
设二面角
的大小为
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.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/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30987c1ff8b2cc69bb6ad6c41bde18b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/e1bd9ede-d661-4b03-9618-561c796b196d.png?resizew=154)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a438393ddfc7da1804baf4932442bb35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次
2020-06-15更新
|
707次组卷
|
3卷引用:山东省泰安市2020届高三6月全真模拟(三模)数学试题
名校
解题方法
4 . 如图在四棱锥
中,平面
底面ABCD,底面ABCD是等腰梯形,
,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/364d6c88726d8c3bb8ed297057332bac.png)
.
![](https://img.xkw.com/dksih/QBM/2020/6/8/2480342232137728/2480701720436736/STEM/9dde8ca597b34fdabdb928ae2b5dd6f1.png?resizew=168)
(1)证明:
.
(2)求平面PCD与平面PAB夹角(锐角)的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aab40c3da31f132ceded9671f5020ab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/364d6c88726d8c3bb8ed297057332bac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff0a0c299356c26338d4153748e8a61d.png)
![](https://img.xkw.com/dksih/QBM/2020/6/8/2480342232137728/2480701720436736/STEM/9dde8ca597b34fdabdb928ae2b5dd6f1.png?resizew=168)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8c231fb9aeaf4b73c2d835bb4c3d42b.png)
(2)求平面PCD与平面PAB夹角(锐角)的余弦值.
您最近一年使用:0次
2020-06-09更新
|
455次组卷
|
3卷引用:湖北省荆门市龙泉中学2020届高三下学期高考适应性考试(二)数学(理)试题
名校
5 . 如图,在三棱柱
中,侧面
是边长为4的菱形,且
,面
面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/425b9792-45ee-4115-8a16-27240fb0b943.png?resizew=207)
(1)求证:
面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93ecf0d955692e3ddacbda6035c70a05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61cdaadeae37736a1e6dd93fa1fe712f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e6fbf78350d99b5310b3d824d6d0943.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/425b9792-45ee-4115-8a16-27240fb0b943.png?resizew=207)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91441b6a208013fa5e8ddf7c8cd1f43d.png)
您最近一年使用:0次
2020-06-03更新
|
379次组卷
|
2卷引用:2020届湖北省武汉市高三下学期5月质量检测理科数学试题
解题方法
6 . 如图,在三棱柱
中,侧面
是边长为4的菱形,且
,面
面
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/0c8e429d-07f4-4bf5-95e3-961f4cb43890.png?resizew=193)
(1)求证:
面
;
(2)求
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6798bf9d72d6d23920a7e30104af2f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61cdaadeae37736a1e6dd93fa1fe712f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94185437d95fb9e4928d88e7798ed160.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/0c8e429d-07f4-4bf5-95e3-961f4cb43890.png?resizew=193)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
您最近一年使用:0次
名校
7 . 如图,在四棱锥
中,
平面
,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/4b6176de-f6cf-4b53-84a3-d7a53edd7e04.png?resizew=160)
(1)求证:
;
(2)求平面
与平面
所成锐二面角的余弦值.
![](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/41cd5c4f8b106d01e0e431078e1a468b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f776c501a180174257d5dff5ed599907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68d31600cba2d5256c7e78b6122d6755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3bbe4cdd2c154bd9a8073b0d4cecb8a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/4b6176de-f6cf-4b53-84a3-d7a53edd7e04.png?resizew=160)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdfa54114f04a75b8c96165b3718ed7f.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef67284b03310b208a185cc6a86d5cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb5255e2159617505e0c87d01437a57.png)
您最近一年使用:0次
2020-05-25更新
|
261次组卷
|
2卷引用:2020届湖北省武汉市部分学校高三下学期5月在线学习摸底检测理科数学试题
8 . 如图,四棱锥
,
平面
,底面
为梯形,
,
,
,
,
为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/a44dd0d9-31ee-46ae-8aee-1aee4a7dd1a5.png?resizew=147)
(1)证明:直线
;
(2)若平面
与棱
交于
,求四棱锥
的体积.
![](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/68d31600cba2d5256c7e78b6122d6755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c985b2a5d41205c53ab4077537c2feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4444f95be7eea686c333f700f9126c96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6493e483da389b042b9e290502ff38ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/a44dd0d9-31ee-46ae-8aee-1aee4a7dd1a5.png?resizew=147)
(1)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4567ae3f7827588855f39569d4f7c5.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14eec658f69c267a70c1e8f9b744e282.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee640f42eb28a85741668f864f486b0e.png)
您最近一年使用:0次
2020-05-25更新
|
339次组卷
|
2卷引用:2020届湖北省荆州市沙市中学高三下学期5月第三次模拟文科数学试题
名校
9 . 已知如图一
,
,
,
,
分别为
,
的中点,
在
上,且
,
为
中点,将
沿
折起,
沿
折起,使得
,
重合于一点(如图二),设为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/46b8dd19-1f97-4ef1-a34e-9ac41298b41c.png?resizew=280)
(1)求证:
平面
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08313da7b66283d2e0b3987f3e6761f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf4f947e0f238c37854afa0bf6b93a8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/46b8dd19-1f97-4ef1-a34e-9ac41298b41c.png?resizew=280)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1d0df73a49d4348a5c1e3aaa149cc8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fbbe7f48676298f2ee0cb1901992eaf.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c19de14651645718682d3d2af5993b0.png)
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名校
10 . 如图,在四棱锥
中,
,
,
,
,
,
.过直线
的平面分别交棱
,
于E,F两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/78ab98ab-6db8-4c47-9d86-683739bf6719.png?resizew=244)
(1)求证:
;
(2)若直线
与平面
所成角为
,且
,
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/413c799e8fb983e6274ec4be9ff6c431.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca7e1a727ba332984ad857b3d25344d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/78ab98ab-6db8-4c47-9d86-683739bf6719.png?resizew=244)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6969b9971ceae406072933356189a897.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974d34de3a12418d6b700420afd1b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf733ac3b5bc538868b9e499021508c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af87eb26942c14c12c35f8258621c5c0.png)
您最近一年使用:0次
2020-05-24更新
|
362次组卷
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2卷引用:2020届重庆市高三5月调研(二诊)数学(理)试题