在矩形ABCD中,AB=1,BC=2,E为AD的中点,如图1,将
沿BE折起,使得点A到达点P的位置(如图2),且平面PBE⊥平面BCDE
(2)若M为PB的中点,N为PC的中点,求三棱锥M﹣CDN的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
(2)若M为PB的中点,N为PC的中点,求三棱锥M﹣CDN的体积.
20-21高三上·江西赣州·期末 查看更多[6]
2020届江西省赣州市高三上学期期末考试数学(文)试题(已下线)第08章+立体几何初步(A卷基础篇)-2020-2021学年高一数学必修第二册同步单元AB卷(新教材人教A版)黑龙江省鹤岗市第一中学2021-2022学年高二上学期开学考试数学试题(已下线)专题13.3 空间图形的表面积和体积(基础练)-2020-2021学年高一数学十分钟同步课堂专练(苏教版2019必修第二册)河南省周口市太康县第一高级中学2023-2024学年高一下学期5月月考数学试题(已下线)核心考点8 立体几何中综合问题 A基础卷 (高一期末考试必考的10大核心考点)
更新时间:2020-09-23 18:38:18
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相似题推荐
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】已知四面体
中,
,
,
,G为底面
的重心,且
.
(1)求线段
的长;
(2)求三棱锥
的体积
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f7193352f0b8f565bf1fa931425ea44.png)
(1)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9cc1e8e828f451cb831456f9f75cbf5.png)
您最近一年使用:0次
【推荐2】如图,在四棱锥
中,底面
是矩形,平面
平面
,
为
的中点,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/5c3e6154-6d80-4b7b-9415-8147ce5ec61a.png?resizew=169)
(1)证明:平面
平面
;
(2)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/e4aa9084b8fe0fe05c4388d1f835587b.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/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01b5fdbef7ac8859e74fd1d79cb47392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db86a481972bd2dc553889617002d146.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/5c3e6154-6d80-4b7b-9415-8147ce5ec61a.png?resizew=169)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39282bdf319f30d7bc261e2e3ab3b1e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3df5935c893580c77ab6fa6eb0a70bdb.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf9718967af7a01c5b4866ea6f73bbb.png)
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【推荐1】在长方体
中,点E、F分别
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/545c0705-6f61-4f0d-8c3d-d679f2ed2d65.png?resizew=175)
(1)求证:
平面
;
(2)若规定两个平面所成的角是这两个平面所组成的二面角中的锐角(或直角),则在空间中有定理:若两条直线分别垂直于两个平面,则这两条直线所成的角与这两个平面所成的角相等.试根据上述定理,在
时,求平面
与平面
所成的角的大小.(用反三角函数值表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad907394843e0d4951df908aa4817175.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93df7ae545875597289d00fbb78f16ab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/545c0705-6f61-4f0d-8c3d-d679f2ed2d65.png?resizew=175)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d26d8a9d64ad3c8cba28840b41ed7837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
(2)若规定两个平面所成的角是这两个平面所组成的二面角中的锐角(或直角),则在空间中有定理:若两条直线分别垂直于两个平面,则这两条直线所成的角与这两个平面所成的角相等.试根据上述定理,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a32aa0247b4099d3c3a19d0bd03d1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab6bf42c7db96104456424e4d1be6c48.png)
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【推荐2】如图,在五面体
中,底面
的对角线
交于点
,
为等边三角形,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/540d0fba5d871492b8956f39cc96fea4.png)
.
(1)证明:
平面
;
(2)若五面体的体积为
,当直线
与直线
所成的角最大时,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dea53cfe562dc39821a67aec2a9ec98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/540d0fba5d871492b8956f39cc96fea4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/19/625d61af-898b-46a2-b1ca-c6a2cc525725.png?resizew=126)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)若五面体的体积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ac1cafa010bf62459ecc36a1a23fef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/306681bd5aaa51e9c63ab3002e23dec5.png)
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解题方法
【推荐3】如图,在四棱锥
中,底面
为矩形,平面
平面
,
分别为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/829f5c28-12d3-47f2-a0a6-ef36d099db17.png?resizew=172)
(1)求证:
平面
;
(2)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
平面
;
(3)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/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d9a395322e3605dc9e7a3da56e33088.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987d5fda0b89a12e9f21e8dd0deb1c3a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/829f5c28-12d3-47f2-a0a6-ef36d099db17.png?resizew=172)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0edb1508fc95765f3bb316bcb5252d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9c68879985182b4de065c552cb8e31.png)
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解题方法
【推荐1】如图在三棱柱
中,
平面
,
,点
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/bc4642d3-2f13-44da-aaf2-a3e1b64d9176.png?resizew=161)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a8e73393beaf059e7dc6a632e3a860c.png)
(2)若
时,求点
到平面
的距离
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a8bfe2553e852df73185d017c0a62fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ba5383e768dc86e1bfd79c10f96f4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/bc4642d3-2f13-44da-aaf2-a3e1b64d9176.png?resizew=161)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a8e73393beaf059e7dc6a632e3a860c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0add37bd623a906bc186c142216a0558.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea848cd2aa3a464618020475097949fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
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【推荐2】如图1,平行四边形
中,
,在
的延长线上取一点
,使得
;现将
沿
翻折到图2中
的位置,使得
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/0b4a9622-4b79-4ea9-aa95-0f5fade6598a.png?resizew=416)
(1)求证:
;
(2)求直线
与面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0678d169017977b991376f329934f0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50c74e015fad57a5e45032d9824f1def.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68696b781af2609327222d22cb7bab3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df40726e5164d40d959120e5d013de91.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/0b4a9622-4b79-4ea9-aa95-0f5fade6598a.png?resizew=416)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ced76e1ee551955a877688618b1f4ad.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8ba89e83329983cfadbfcdda151aaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cb3ccef834032b6e09cdb50103c3e75.png)
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名校
【推荐3】如图,已知四面体
中,
平面
,
.
![](https://img.xkw.com/dksih/QBM/2023/1/11/3150440558288896/3150756208951296/STEM/341340cd0e2846c889c35ee695ee889d.png?resizew=181)
(1)求证:
;
(2)《九章算术》中将四个面都是直角三角形的四面体称为“鳖臑”,若此“鳖臑”中,
,有一根彩带经过面
与面
,且彩带的两个端点分别固定在点
和点
处,求彩带的最小长度;
(3)若在此四面体中任取两条棱,记它们互相垂直的概率为
;任取两个面,记它们互相垂直的概率为
;任取一个面和不在此面上的一条棱,记它们互相垂直的概率为
. 试比较概率
、
、
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
![](https://img.xkw.com/dksih/QBM/2023/1/11/3150440558288896/3150756208951296/STEM/341340cd0e2846c889c35ee695ee889d.png?resizew=181)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bf10d92f20501e19d25f6f4159aab89.png)
(2)《九章算术》中将四个面都是直角三角形的四面体称为“鳖臑”,若此“鳖臑”中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce519312a849963b376c202c3f9d7cf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)若在此四面体中任取两条棱,记它们互相垂直的概率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/797e67927616b141ed7c6b83f8b6f4fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/797e67927616b141ed7c6b83f8b6f4fb.png)
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解答题-证明题
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解题方法
【推荐1】三棱台
中,
,平面
平面ABC,
,
与
交于D.
(1)证明:
平面
;
(2)求异面直线
与DE的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/976a71549531461110dae48b0595f67f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce04b35c265cc9c48b60204bd2f718ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/793b4f1d99551a983ccaa8e5631cf997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/1/c39440e6-7d47-45ad-a8a9-936c70e0a0cb.png?resizew=192)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75aea24647cd4d0b4b9aa513bf5457b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9539f8fb13345b449274b67bbda995db.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
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解题方法
【推荐2】如图,
是等腰直角三角形,
,四边形
是直角梯形,
,
,且
,平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/17/8aa4f890-4631-4fcd-a9b2-f1d65151bafd.png?resizew=160)
(1)求证:
;
(2)若点E是线段
上的一动点,问点E在何位置时,三棱锥
的体积为
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f9fba8a4098c1a0515286eb8d616dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae17686725a5ecc001c809cfc35d1429.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0760712e3e2ea02b755b751e760d0c55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4685bc53d11be0f30476c377d76561.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1801ddbdf49f88c1800b422f108f0ec7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bb5012f6c70a1e98d682b6d021fadd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0760712e3e2ea02b755b751e760d0c55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/17/8aa4f890-4631-4fcd-a9b2-f1d65151bafd.png?resizew=160)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/804c0e2a375b5f4ff1c420532968efc3.png)
(2)若点E是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6fea520be511f0bca09d795851b0fa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eba0bd4a60613ffd02e08bdd1a1eebe.png)
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