1 . 在四棱锥
中,底面
是平行四边形,
,
,
是边长为
的等边三角形,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/29ec3e79-4fcd-496a-9bc8-e299161b44fc.png?resizew=232)
(1)证明:平面
平面
;
(2)在线段
上是否存在一点
,使得
平面
?说明理由.
![](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/c2bdcd23d2c26d9df0b4756d8a715673.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63ab13ef156d034b710d811e09b0be34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b44f4120c94cb7176dc31fcac387b32e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/29ec3e79-4fcd-496a-9bc8-e299161b44fc.png?resizew=232)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342d452a7b850cd3a15b23619ad39bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36222db36e348661eb5f616820e4e60f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb304d905125170bebfada27e7ed8960.png)
您最近一年使用:0次
2019-04-18更新
|
827次组卷
|
5卷引用:【校级联考】甘肃省白银市靖远县2019届高三第四次联考数学(文)试题
【校级联考】甘肃省白银市靖远县2019届高三第四次联考数学(文)试题【市级联考】陕西省榆林市2019届高三第四次普通高等学校招生模拟考试文科数学试题2019届陕西省榆林市高三第四次模拟考试数学(文)试题(已下线)专题25 立体几何中的最值,探索性问题-冲刺2020高考跳出题海之高三数学模拟试题精中选萃青海省西宁市大通回族土族自治县2021届高三二模数学(文)试题
2 . 如图,在四边形
中,
,
,点
在
上,且
,
,现将
沿
折起,使点
到达点
的位置,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/ae1984cd-77ff-46fd-9224-26f6cd609760.png?resizew=217)
(1)求证:平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e20b970f3b0dc1c9a3de6eb09beead.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf4dc4d7d30af1cdce660795e0fd7d7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77e3c1c236141d6118429fade0a9b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e746976f17deead4938be625cbd730c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fe9c621b75cf8fbe360395a3c4a3ef2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/ae1984cd-77ff-46fd-9224-26f6cd609760.png?resizew=217)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/483f030abf61c6a0882d656d63cf4512.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2cb6f19080f8be382b484274b2476c.png)
您最近一年使用:0次
2019-03-28更新
|
827次组卷
|
6卷引用:2019届甘肃省兰州市第一中学高三5月月考数学(文)试题
3 . 如图所示:在五面体ABCDEF中,四边形EDCF是正方形,AD=DE=1,∠ADE=90°,∠ADC=∠DCB=120°.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/bdfc65fd-ed2e-4f87-ba3b-23b6982fc0d5.png?resizew=178)
(Ⅰ)求证:平面ABCD⊥平面EDCF;
(Ⅱ)求三棱锥A-BDF的体积.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/bdfc65fd-ed2e-4f87-ba3b-23b6982fc0d5.png?resizew=178)
(Ⅰ)求证:平面ABCD⊥平面EDCF;
(Ⅱ)求三棱锥A-BDF的体积.
您最近一年使用:0次
2019-03-26更新
|
949次组卷
|
4卷引用:甘肃省天水市第一中学2019届高三下学期第三次模拟考试数学(文)试题
4 . 如图,在三棱柱
中,
平面
,
为
边上一点,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/2aee7a1a-4508-4a61-8739-b4b5090a410c.png?resizew=168)
(1)证明:平面
平面
.
(2)若
,试问:
是否与平面
平行?若平行,求三棱锥
的体积;若不平行,请说明理由.
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf9ad150cb1e4cd8977d4cc3d99be17c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7eca2ce72ab61c34ed2a7b24314476.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/2aee7a1a-4508-4a61-8739-b4b5090a410c.png?resizew=168)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2340abb56da9c571b7f17bb21cabe010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532aece6cfd67e2a97977eed978dbf2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b2213b575a7cfaffcdf91885005c7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae8d3b9d3566bf45e46339cf3bfef5ce.png)
您最近一年使用:0次
2019-03-25更新
|
724次组卷
|
7卷引用:【省级联考】甘青宁2019届高三3月联考数学(文)试题
5 . 如图所示,在多面体ABCDEF中,四边形ADEF为正方形,AD∥BC,AD⊥AB,AD=2BC=1.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/b127b727-47e6-4796-a253-36181d953c8e.png?resizew=159)
(1)证明:平面ADEF⊥平面ABF.
(2)若AF⊥平面ABCD,二面角A-BC-E为30°,三棱锥A-BDF的外接球的球心为O,求二面角A-CD-O的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/b127b727-47e6-4796-a253-36181d953c8e.png?resizew=159)
(1)证明:平面ADEF⊥平面ABF.
(2)若AF⊥平面ABCD,二面角A-BC-E为30°,三棱锥A-BDF的外接球的球心为O,求二面角A-CD-O的余弦值.
您最近一年使用:0次
2019-03-25更新
|
684次组卷
|
6卷引用:【省级联考】甘肃、青海、宁夏2019届高三3月联考数学(理)试题
6 . 在四棱柱
中,已知底面ABCD是菱形,
平面ABCD,M、N分别是棱
、
的中点
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/7bc6777e-a4a7-4fbd-9dc9-c48c582f2580.png?resizew=159)
证明:
平面DMN;
证明:平面
平面在
D.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd694ad3a4733c7c84aaa7946aeea4de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/326a3339175592bd1e793a9054d57fe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3225b8916372c7e0e4d7b71b26571e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/823e998089a7f79b713d3862ab2e81aa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/7bc6777e-a4a7-4fbd-9dc9-c48c582f2580.png?resizew=159)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de411e207364bd4bdc34bc925d27f869.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a38f7b7c4ac9e79fb32b02bd26acefa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae4779134c28e991b5395939a4de8321.png)
您最近一年使用:0次
2019-03-13更新
|
815次组卷
|
5卷引用:甘肃省白银市靖远县2018-2019学年高一上学期期末数学试题
7 . 如图,在四棱锥
中,四边形
为直角梯形,
,
,平面
平面
,
分别为
的中点,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/d4bd817a-2232-4c2b-8055-7acd35e29434.png?resizew=197)
(I)求证:平面
平面
;
(II)求三棱锥
的体积.
![](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/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ff6d7dd48b57f03d82d2c522ee9b94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c591629994e061d2578b5c54d2b24c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40bea87ae1d98d54ca869f97c3b24532.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8254b52b379a420c17d38334940b073.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5729dd997ea7e8cb4cef8b7165b36e00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18120a244d3a1f9c1688bf53eb2ad775.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/d4bd817a-2232-4c2b-8055-7acd35e29434.png?resizew=197)
(I)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a3fd5284e160896f07ce367645fd04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c51c4a1148587943fe9ba210f6141ee.png)
(II)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffb7a7a6d15786daa7fb370d80f0b54.png)
您最近一年使用:0次
2019-03-03更新
|
982次组卷
|
6卷引用:甘肃省张掖市临泽县第一中学2018-2019学年高二下学期期末数学(文)试题
名校
解题方法
8 . 如图,在四面体
中,
,
分别是线段
,
的中点,
,
,
,直线
与平面
所成的角等于
.
(1)证明:平面
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12707ebb0214da5cd094c2c6b884de59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75cba440ab7c5e219878a2d2c9302b0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdcad04a7d2c0460dbfa3e69f80a9e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9171484a68c84cad91e4f2233392f600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70a0eb6045369a13358f2d5999f7bc3e.png)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86b79329c2bab6ad95c15d60e18a0ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e04a5b59cced25ab7057d03fe3c0ad.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e59eb4371f33957a2f556a75c8a01a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/795291ad-f504-4a38-90ba-8dd1b836ad05.png?resizew=120)
您最近一年使用:0次
2019-03-02更新
|
6570次组卷
|
19卷引用:甘肃省白银市会宁县会宁县第一中学2019-2020学年高二上学期期末数学(理)试题
甘肃省白银市会宁县会宁县第一中学2019-2020学年高二上学期期末数学(理)试题【校级联考】河北省五个一名校联盟2019届高三下学期第一次诊断考试数学(理)试题江西省吉安市第一中学、新余一中2019届高三下学期第一次联考数学(理)试题【全国百强校】四川省成都外国语学校2018-2019学年高二3月月考数学(理)试题【全国百强校】黑龙江省鹤岗市第一中学2018-2019学年高二下学期第二次月考数学(理)试题广东省深圳市宝安区2018-2019学年高二下学期期末考试数学理试卷2020届山西省大同四中联盟体高三3月模拟考试数学(理)试题(已下线)必刷卷07-2020年高考数学必刷试卷(新高考)【学科网名师堂】-《2020年新高考政策解读与配套资源》2020届山西省大同市第一中学高三2月模拟(一)数学(理)试题安徽省滁州市明光中学2019-2020学年高二下学期开学考试数学(理)试题(已下线)卷07-2020年高考数学冲刺逆袭必备卷(山东、海南专用)【学科网名师堂】陕西省渭南市大荔县2018-2019学年高二下学期转段考试数学(理)试题河北省石家庄市第二中学2020-2021学年高二上学期8月线上考试(一)数学试题江西省赣州市赣县第三中学2019-2020学年高二6月份考试数学(理)试题(已下线)【新东方】杭州新东方高中数学试卷353河南省洛阳市新安县第一高级中学2020-2021学年第一学期高二月考数学试题宁夏吴忠市吴忠中学2020-2021学年高二上学期期中考试数学(理)试题山西省大同一中2020-2021学年高二上学期期中理科数学试题安徽省淮南市2019-2020学年高二上学期期终教学质量检测理科数学试题
9 . 如图,在四棱锥
中,底面
为平行四边形,
,
,
为边长为
的等边三角形,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/c9cd7a6f-2c25-4af5-9b29-040694c03323.png?resizew=218)
(1)证明:平面
平面
;
(2)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/c2bdcd23d2c26d9df0b4756d8a715673.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63ab13ef156d034b710d811e09b0be34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b44f4120c94cb7176dc31fcac387b32e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/c9cd7a6f-2c25-4af5-9b29-040694c03323.png?resizew=218)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342d452a7b850cd3a15b23619ad39bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c5651e38293e0c42a7278af69fa53ae.png)
您最近一年使用:0次
2019-02-03更新
|
931次组卷
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3卷引用:【校级联考】甘肃省靖远县2019届高三第四次联考数学(理)试题
10 . 如图,在四棱锥P-ABCD中,底面ABCD为平行四边形,点O为对角线BD的中点,点E,F分别为棱PC,PD的中点,已知PA⊥AB,PA⊥AD.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/58792de1-d7e5-49b8-b712-34c63c53534a.png?resizew=160)
(1)求证:直线PB∥平面OEF;
(2)求证:平面OEF⊥平面ABCD.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/58792de1-d7e5-49b8-b712-34c63c53534a.png?resizew=160)
(1)求证:直线PB∥平面OEF;
(2)求证:平面OEF⊥平面ABCD.
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2019-02-01更新
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5卷引用:【市级联考】江苏省泰州市2019届高三上学期期末考试数学试题
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