解题方法
1 . 如图,在四棱锥
中,已知
底面ABCD,
,异面直线PA和CD所成角等于
.
(2)在棱PA上是否存在一点E,使得平面PAB与平面BDE夹角的正切值为
?若存在,指出点E在棱PA上的位置;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14f9990e627fa384d289c187deb0696e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
(2)在棱PA上是否存在一点E,使得平面PAB与平面BDE夹角的正切值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
您最近一年使用:0次
2023-10-20更新
|
414次组卷
|
5卷引用:安徽省宣城市六校2021-2022学年高二上学期期中联考数学试题
安徽省宣城市六校2021-2022学年高二上学期期中联考数学试题【全国百强校】辽宁省本溪满族自治县高级中学2017-2018学年高二下学期第二次月考理数试题贵州省六盘水市纽绅中学2023-2024学年高二上学期10月月考数学试题(已下线)模块二 专题3 利用空间向量解决立体几何中复杂问题 期末终极研习室(高二人教A版)(已下线)专题01 空间向量与立体几何(3)
2 . 如图,在四棱锥P-ABCD中,PC⊥底面ABCD,ABCD是直角梯形,AD⊥DC,AB∥DC,AB=2AD=2CD=2,点E是PB的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/6/30dd76af-e956-4fb4-9ad1-1fc6c9d2643a.png?resizew=183)
(1)证明:平面EAC⊥平面PBC;
(2)若直线PB与平面PAC所成角的正弦值为
;
①求三棱锥P-ACE的体积;
②求二面角P-AC-E的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/6/30dd76af-e956-4fb4-9ad1-1fc6c9d2643a.png?resizew=183)
(1)证明:平面EAC⊥平面PBC;
(2)若直线PB与平面PAC所成角的正弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
①求三棱锥P-ACE的体积;
②求二面角P-AC-E的余弦值.
您最近一年使用:0次
2022-07-05更新
|
2841次组卷
|
8卷引用:北京十一学校2020-2021学年高二上期末数学试题
北京十一学校2020-2021学年高二上期末数学试题北京市十一学校2020-2021学年高二上学期期末考试数学试题空间向量的应用重庆市名校联盟2021届高三上学期第二次联合测试数学试题江苏省宿迁市沭阳县修远中学2020-2021学年高三(艺术班)上学期第四次质量检测数学试题(已下线)第02讲 基本图形的位置关系(3)(已下线)专题08 立体几何综合-备战2023年高考数学母题题源解密(新高考卷)(已下线)7.5 空间向量求空间角(精练)
名校
3 . 如图,在四棱锥
中,底面
是梯形,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/d87ac686-132c-4c98-aefd-48a08fa85b89.png?resizew=176)
(1)证明:
平面
;
(2)若
,当四棱锥
的体积最大时,求直线
与平面
所成角的正弦值.
![](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/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e839ac941e8bf536ff35a12e56c7a400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0453cfd7e92bf7746a88280b9e7b580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a95e9a6796947315b7a563949fd1e5a7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/d87ac686-132c-4c98-aefd-48a08fa85b89.png?resizew=176)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e921f46d90e43f4517c55832b6280f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
您最近一年使用:0次
2021-09-04更新
|
3085次组卷
|
7卷引用:安徽省安庆市桐城市第八中学2021-2022学年高二上学期第一次月考数学试题
安徽省安庆市桐城市第八中学2021-2022学年高二上学期第一次月考数学试题(已下线)规范答题-立体几何山东省潍坊第四中学2022届高三上学期第一次过程检测数学试题广东省华南师范大学附属中学2022-2023学年高二上学期阶段(一)数学试题浙江省2022届高三水球高考命题研究组方向性测试Ⅳ数学试题(已下线)一轮复习大题专练49—立体几何(线面角1)—2022届高三数学一轮复习(已下线)河南省南阳市2022-2023学年高三上学期期末数学(理)试题变式题16-20
名校
4 . 如图,已知四边形
是正方形,
平面
.
![](https://img.xkw.com/dksih/QBM/2021/12/31/2884573139738624/2887232471121920/STEM/64a1344f-fb6f-4dce-8376-d58dfba4795d.png?resizew=280)
(1)求点D到平面
的距离;
(2)在线段
上是否存在点E,使
平面
?若存在,求
的值;若不存在,说明理由.
![](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/1b55fce0a4716058fe0ad64b01eccc66.png)
![](https://img.xkw.com/dksih/QBM/2021/12/31/2884573139738624/2887232471121920/STEM/64a1344f-fb6f-4dce-8376-d58dfba4795d.png?resizew=280)
(1)求点D到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4a0d511365abd9df144a412ccd4615.png)
您最近一年使用:0次
2022-01-04更新
|
771次组卷
|
2卷引用:上海市建平中学2021-2022学年高二上学期12月月考数学试题
名校
解题方法
5 . 如图,四棱锥
的底面
是平行四边形,
,
,
,
,
,点
是线段
(包括端点)上的动点.
![](https://img.xkw.com/dksih/QBM/2021/12/24/2879411643064320/2881600186138624/STEM/ef155021f86840aa85ab147139f229ba.png?resizew=197)
(1)若
(
)时,平面
平面
,求
的值;
(2)平面
和平面
的夹角为
,直线
与平面
所成角为
,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/db27b7f29d7d01b2692f217bc3079fc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0df49b91d399a0b28d5ad86b84b1f42d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f14fe22376f70a50752d3e146b8e1b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2021/12/24/2879411643064320/2881600186138624/STEM/ef155021f86840aa85ab147139f229ba.png?resizew=197)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/864aec7b9cfafb79090d533c63df5c2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd3ede869e508a8c8bda34a16782f863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d96357a07048ba79b8c84097d359d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/425bb0d1c21eb4448dbbe9a41efa7538.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(2)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/425bb0d1c21eb4448dbbe9a41efa7538.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/425bb0d1c21eb4448dbbe9a41efa7538.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8dc4c63a548b91061528aa11058de75.png)
您最近一年使用:0次
2021-12-27更新
|
729次组卷
|
2卷引用:重庆市巴南中学2021-2022学年高二上学期期中数学试题
名校
解题方法
6 . 在①
,②
,③
,这三个条件中选择一个,补充在下面问题中,并给出解答
如图,在五面体
中,已知___________,
,
,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/3bdae97f-1469-4747-829f-667660e2fca3.png?resizew=212)
(1)求证:平面
与平面
;
(2)线段
上是否存在一点
,使得平面
与平面
夹角的余弦值等于
,若存在,求
的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f57cb0d726cc25a350dc792b539ff2f2.png)
如图,在五面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc22c901160e072ae13a66f62c489f21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d05426a41ec7b22c0445bfe78d786c8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7422660f0635be92e11838af5f4b4b5e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/3bdae97f-1469-4747-829f-667660e2fca3.png?resizew=212)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5f0cfc1049f84a04c81bd213afb8d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/293a2e244834864e78e93d8c13be6905.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72acf5ee54c89dede4358c61ecd7a101.png)
您最近一年使用:0次
2021-12-22更新
|
2295次组卷
|
7卷引用:浙江省杭州第二中学滨江校区2021-2022学年高二上学期期中数学试题
浙江省杭州第二中学滨江校区2021-2022学年高二上学期期中数学试题山西省运城市2022届高三上学期期末数学(理)试题重庆市第八中学2022届高三下学期调研检测(五)数学试题(已下线)数学-2022届高三下学期开学摸底考试卷(山东专用)四川省成都市石室中学2021-2022学年高三下学期第三次诊断性考试数学(理)试题(已下线)北京市丰台区2023届高三下学期3月一模数学试题变式题16-21江苏省扬州市2024届高三上学期期初模拟数学试题
7 . 在棱长为2正方体
中,
,
分别为
和
的中点,
为
上的动点,平面
与棱
交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/cf26b004-235d-48d6-834c-f404ba8c046e.png?resizew=161)
(1)求证:点
为
中点;
(2)求证:
;
(3)当
为何值时,
与平面
所成角的正弦值最大,并求出最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/320e6d8f4930226455010435a200deef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/cf26b004-235d-48d6-834c-f404ba8c046e.png?resizew=161)
(1)求证:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/725402aaa8a61fab0f5ac6f73130c17f.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/408871c2b71ef88d6f556ce53cf73cc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be61a34b88a6cfa41578030cf42d3ef3.png)
您最近一年使用:0次
名校
解题方法
8 . 如图,在四棱柱
中,侧棱
底面
,
,
,
,
,且点M和N分别为
和
的中点.
![](https://img.xkw.com/dksih/QBM/2021/12/7/2867128152948736/2871513771614208/STEM/855ea999-2d42-49a7-a059-79eb5243e961.png?resizew=267)
(1)求二面角
的正弦值;
(2)求点
到平面
的距离;
(3)设E为棱
上的点,若直线
和平面
所成角的正弦值为
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c9d5815dc775d5a5810fff0b016a8d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70c2888dad200ebe6cbc60b7a680ad6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e3334853138fb74687d66b1e45f2fd9.png)
![](https://img.xkw.com/dksih/QBM/2021/12/7/2867128152948736/2871513771614208/STEM/855ea999-2d42-49a7-a059-79eb5243e961.png?resizew=267)
(1)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88595db9e3a4bf66275eae21fe0238e7.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fefd8229243bcbee5ac197740e6c66ab.png)
(3)设E为棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d8e33929752b1cb4dd36ee9b98b45d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce1b066f8869d0ff4513f7a99745125.png)
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2021-12-13更新
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4卷引用:辽宁省沈阳市第一中学2021-2022学年高二上学期10月月考数学试题
名校
解题方法
9 . 如图,在平行六面体
中,
,
,
平面
,
与底面
所成角为
,设直线
与平面
、平面
、平面
所成角的大小分别为
,
,
.
![](https://img.xkw.com/dksih/QBM/2021/12/8/2867895240761344/2870096610721792/STEM/8241a56e-d0c5-43cb-b89e-2132e992dbfb.png?resizew=253)
(1)若
,求平行六面体
的体积
的取值范围;
(2)若
且
,求
,
,
中的最大值;
(3)若
,
,
,
,(其中
,
是指
,
中的最大的数),求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4890e58791814622b87c4d60ea971f54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7253ffd3fc633d861810ee2e872188b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
![](https://img.xkw.com/dksih/QBM/2021/12/8/2867895240761344/2870096610721792/STEM/8241a56e-d0c5-43cb-b89e-2132e992dbfb.png?resizew=253)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/753918a2f9bf67323985123eeb27a262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/753918a2f9bf67323985123eeb27a262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d57678b93f1dcb18d4cbb33ff70bce0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32e1b499d6b25ee132abcdd3f3cd288.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7c0fea57d7be8d9298602a62980cc4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f59a7d504cee9a09f81c8c74dcc8f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27a312ba229d4517afecfe11be4098d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1099fa2f6ed4b7a90a7645a191876b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e71d09236e2babb34bc921dbe7185e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a76b8027a664ebe27b23e6842cbb9fb.png)
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名校
10 . 如图,在四棱锥
中,
,
,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/4771a2b5-0e4e-45c7-8696-8417ae43f67b.png?resizew=228)
(1)证明:
平面
;
(2)在线段
上是否存在一点F,使直线CF与平面PBC所成角的正弦值等于
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db27b7f29d7d01b2692f217bc3079fc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8733db9298e8e4f7b4acec192302abc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96ee7262d0b5cbbade014e07e7373501.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05a804871ee7879825cae74b89c1c464.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd36aa6eefefd1e32b2f207d78891b7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/4771a2b5-0e4e-45c7-8696-8417ae43f67b.png?resizew=228)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
您最近一年使用:0次