如图,四棱锥
中,侧面PAD为等边三角形且垂直于底面ABCD,
,
,E是PD的中点.
平面PAB;
(2)点M在棱PC上,且直线BM与底面ABCD所成角为
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78aafccd397e9c88a567abf4993d40f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7af36689a2d2a5f999b3b5859a3c9faf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d27ff0b39832f094ec51e28721d739.png)
(2)点M在棱PC上,且直线BM与底面ABCD所成角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96fe44cb45b52ade75574ed31d05fb26.png)
更新时间:2024-05-24 18:03:02
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】在四棱锥
中,已知底面
为正方形,
底面
,且
,
为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/8c58fcf8-ae1e-4aa7-856f-5229d73e95f8.png?resizew=143)
(1)求证:
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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b10835116b9b777a666b438c907b49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/8c58fcf8-ae1e-4aa7-856f-5229d73e95f8.png?resizew=143)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa69a2247ad4d5231aa361349b12f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a351d71fa01d3f5920e374a8ee7b524.png)
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解答题-证明题
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适中
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【推荐2】如图所示的长方体
中,底面
是边长为
的正方形,
为
与
的交点,
,
为线段
的中点.
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/c4c0dc5bdad147c188be90a2fe352233.png)
(1)求证:
平面
;
(2)求三棱锥
的体积.
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/a4625ff0e63344738c1115e0413ad10c.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/367ae09227b44c2c805c556040db89a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/072f6d1b7a814b5f8694a4014f3b304d.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/b5496cf7f1794d58969f0b16feaa0204.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/4b44a9eea3da451fad75ae7fbab320e5.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/b119ee960e2b4e6ab783f5412fa24654.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/ad2e74fad5af46c194b6c703b014e274.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/8f50f64be8ff48b3a262d73f51fa7f66.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/c4c0dc5bdad147c188be90a2fe352233.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/edc67707ab0848be88102a2869007e39.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/7580a52f8fcf48e2afb2a019198df8fa.png)
(2)求三棱锥
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/565c676a00cf478294b59718e8c686c2.png)
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解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】已知如图①,在菱形ABCD中,∠A=60°且AB=2,E为AD的中点,将△ABE沿BE折起使
,得到如图②所示的四棱锥A﹣BCDE,在四棱锥A﹣BCDE中,求解下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/39ae8908-1ae2-41cf-9ef1-94a45f8313ed.png?resizew=366)
(1)求证:BC⊥平面ABE;
(2)若P为AC的中点,求二面角P﹣BD﹣A的余弦值;
(3)求直线BC与平面ABD所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a88c44f558705de3bcefcfc0ece96b8f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/39ae8908-1ae2-41cf-9ef1-94a45f8313ed.png?resizew=366)
(1)求证:BC⊥平面ABE;
(2)若P为AC的中点,求二面角P﹣BD﹣A的余弦值;
(3)求直线BC与平面ABD所成角的正弦值.
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,在三棱柱
中,
底面ABC,
,
,D为AC的中点,N为
与
的交点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/bcd54226-a0b6-4b93-92aa-93171d3769ef.png?resizew=131)
(1)证明:
平面
;
(2)设
,求直线
与平面
所成角的正弦值.
![](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/fa9591a08d48c6b080c4f9d74f79463f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/bcd54226-a0b6-4b93-92aa-93171d3769ef.png?resizew=131)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504a36c231b8e80724d01649e7c0944f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a42cece6a8fb2f94308882d086e1e2f.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a42cece6a8fb2f94308882d086e1e2f.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
名校
【推荐3】如图,已知
,
,
,平面
平面
,
,
,
为
中点.
![](https://img.xkw.com/dksih/QBM/2021/12/20/2876609582915584/2877537122918400/STEM/d844e9c6-90c5-469c-b79b-42af7be7b10a.png?resizew=292)
(1)证明:
平面
;
(2)求直线
与平面
所成角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b29d66044d614bc0ce7950ad0a931cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4340375ca8abdbd6998760c944f38d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/306b9504b52df5ad6697fa87200e8a44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/738a7bc24f39d08ba3752418055e1d1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/2021/12/20/2876609582915584/2877537122918400/STEM/d844e9c6-90c5-469c-b79b-42af7be7b10a.png?resizew=292)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5f445af1ae136773cb338920552ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
您最近一年使用:0次
解答题-证明题
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(0.65)
名校
解题方法
【推荐1】如图,在四棱锥
中,
平面
,
,四边形
满足
且
,点
为
的中点,点
为
边上的动点,且
.
(1)求证:平面
平面
;
(2)是否存在实数
,使得二面角
的余弦值为
?若存在,试求出实数
的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.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/36b72c6d2ae4924f930c437542b3356a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ceaaa79e46803fd665d457dc9c7875c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/537f007215286bb97a3f23b2f1617608.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/30/ed1c9f80-54c2-4a0c-97d3-7291f48f76df.png?resizew=167)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bb5012f6c70a1e98d682b6d021fadd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48c7a28689896cc033a327f899a79544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
名校
【推荐2】如图,直棱柱
中,
分别是
的中点,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/1fb8f5ca-9c71-46f2-8917-282d52253fef.png?resizew=150)
(1)证明:
平面
;
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7db7c08836b6577b49677115aefe31f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a773f779cd892616a4ff68d3715f173.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf6c80edb989cd755d5850d077b5de02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/1fb8f5ca-9c71-46f2-8917-282d52253fef.png?resizew=150)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f5830646a912c3a916beac4f88c116b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74bca84ad86c648d3bb20c8909c8da3f.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22934248a81f9f16b1a6d72ea0fd116f.png)
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解答题-证明题
|
适中
(0.65)
【推荐3】如图,在四棱锥
中,底面
是矩形,
,
,
是棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/681d78ce-f1bf-4f91-8c47-517ef4c438e2.png?resizew=159)
(1)求证:
平面
;
(2)若
,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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974d34de3a12418d6b700420afd1b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbb05b8b630052ff544249ebd72d95d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/681d78ce-f1bf-4f91-8c47-517ef4c438e2.png?resizew=159)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa9edd2e61629ddf4c758808838d4478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e66cef506a91c5e28723f6f19895c27b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c80c2240af31b07857eaac003b3d8132.png)
您最近一年使用:0次