如图,四棱锥
中,
平面
,
,
,
,
,
为线段
上一点,点
在边
上且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/27/05e0712e-b8e4-4622-93ff-b9b138b005f9.png?resizew=164)
(1)若
为
的中点,求四面体
的体积;
(2)在线段
上是否存在点
,使得
与平面
所成角的余弦值是
?若存在,求出
的长;若不存在,请说明理由.
![](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/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8ef58be8708144272538ee427fb92c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d45a0192c409933bac6be052aa782b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aac18b0388014ae20b2add2975ef56aa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/27/05e0712e-b8e4-4622-93ff-b9b138b005f9.png?resizew=164)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8478d44601ee6159787ef29f00b85225.png)
(2)在线段
![](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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee72fd8a5a52d08a4fddcf0830a8e103.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1174142f3bba761585b6bc2653009b36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
更新时间:2023-04-24 09:40:47
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解答题-证明题
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【推荐1】如图,在多面体ABCDFE中,四边形ABCD是矩形,AB∥EF,AB=2EF,∠EAB=90°,平面ABFE⊥平面ABCD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/b8443ebe-8178-4742-b292-612f227ea343.png?resizew=174)
(1)若G点是DC的中点,求证:FG∥平面AED.
(2)求证:平面DAF⊥平面BAF.
(3)若AE=AD=1,AB=2,求三棱锥D-AFC的体积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/b8443ebe-8178-4742-b292-612f227ea343.png?resizew=174)
(1)若G点是DC的中点,求证:FG∥平面AED.
(2)求证:平面DAF⊥平面BAF.
(3)若AE=AD=1,AB=2,求三棱锥D-AFC的体积.
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【推荐2】已知正方体
中,E是
的中点,
是
的中点.
平面
;
(2)设正方体的棱长为2,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f11f1840eb8b17e7b07c3fe7e987a9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
(2)设正方体的棱长为2,求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9c31176e441852e88e002aa65a5923d.png)
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【推荐1】如图,圆柱的轴截面ABCD是边长为6的正方形,下底面圆的一条弦EF交CD于点G,其中
.
(1)证明:平面
平面ABCD;
(2)判断母线BC上是否存在点P,使得直线PE与平面AEF所成的角的正弦值为
,若存在,求CP的长;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10abea18553d000703d8c1b4582579d5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/a09fdf37-696d-4a30-a5af-30d219b1a446.png?resizew=129)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6501f1c913a4ef64957a2f01ab5baa15.png)
(2)判断母线BC上是否存在点P,使得直线PE与平面AEF所成的角的正弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
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【推荐2】如图,在三棱锥
中,
,
.
![](https://img.xkw.com/dksih/QBM/2020/12/25/2621806755790848/2623798689505280/STEM/a2ed9d14-060b-4db5-ab9f-3a22c62ecbde.png)
(1)证明:平面
平面ABC;
(2)点M在棱BC上,且PC与平面PAM所成角的正弦值为
,求BM.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb4957406b21df59fdf7fa184752287b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13c0335337b78973a170b8f3dbe44525.png)
![](https://img.xkw.com/dksih/QBM/2020/12/25/2621806755790848/2623798689505280/STEM/a2ed9d14-060b-4db5-ab9f-3a22c62ecbde.png)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
(2)点M在棱BC上,且PC与平面PAM所成角的正弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/802e162b98c280720fcb909cf392fda3.png)
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【推荐1】图1是直角梯形
,
,
,
,
,
,
,以
为折痕将
折起,使点
到达
的位置,且
,如图2.
![](https://img.xkw.com/dksih/QBM/2022/5/17/2981525137793024/2982751922937856/STEM/f1bd5071-7dde-48ca-8073-f0a4fbfd25be.png?resizew=320)
(1)求证:平面
平面
;
(2)若点P为线段
上靠近点
的三等分点,求点
到平面
的距离?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8cfd06965af6014208127f2880b476b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/430b77d8d2a99713b192dc729ddc2275.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d4746df85049d1651d3f6c30212a7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8532a0a284607c77a23edcd0a679a560.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c78c42d8ecf30f7174c9ddfb7d40b76a.png)
![](https://img.xkw.com/dksih/QBM/2022/5/17/2981525137793024/2982751922937856/STEM/f1bd5071-7dde-48ca-8073-f0a4fbfd25be.png?resizew=320)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/570723ec1803bb3a69f220ad7df50226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d70676406f26d339465fe3473c0c05.png)
(2)若点P为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2eb89294b31ffdd2680b4361e8994d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64eb31601464364be2baf4aa87404bcd.png)
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【推荐2】如图,在四棱锥
中,底面
为矩形,
平面
,
,点E在线段
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/6a9156fd-743e-4fdd-88db-46b26c7c75c0.png?resizew=157)
(1)求证:
平面
;
(2)求点A到平面
的距离.
![](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/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e3a651a1b704e4448c4ab8f41d2c0af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea8ecef114636eab2c939ebc5b84d77e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/6a9156fd-743e-4fdd-88db-46b26c7c75c0.png?resizew=157)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b190c8d3d7d7d0e6e959e8a52eae90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(2)求点A到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9068f29d671d76d1e95ba3a4eaff5b96.png)
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【推荐1】如图,正方形
与等腰直角三角形
所在平面互相垂直,
,E,F分别是
的中点,G是
上的点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/4e5e5578-966f-4296-9601-68a3d2482d95.png?resizew=142)
(1)试确定点G的位置;
(2)求
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cf468f5132e14ee1d8cc766808b11af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374fe9986ebbc986fc422e514ab93a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb47c199e760eb50b846f2bab89ab9b8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/4e5e5578-966f-4296-9601-68a3d2482d95.png?resizew=142)
(1)试确定点G的位置;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16b6c178f909ee8ee16fdb58fd2c5fd1.png)
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【推荐2】四棱锥
的底面是梯形,
,
,
平面
,
,
,M为线段
的中点
![](https://img.xkw.com/dksih/QBM/2021/11/15/2851586433064960/2857627142504448/STEM/8a12b21a-9c4e-4fc1-b672-3c15026e0b23.png?resizew=227)
(1)求二面角
的余弦值
(2)线段
上是否存在一点N,使![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
平面
?若存在,请确定点N的位置;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eaa1a14893960a7032a20c06de41ef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2021/11/15/2851586433064960/2857627142504448/STEM/8a12b21a-9c4e-4fc1-b672-3c15026e0b23.png?resizew=227)
(1)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64785e4401e1d79632e360fd3626ed62.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc46688d8723cf2003fc25890265200.png)
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