如图所示,已知四边形
是边长为2的菱形,
,
,且
平面
,
//
,且异面直线
和
所成角的余弦值为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fa63d3e323e0af20561b36a81aab19e.png)
![](https://img.xkw.com/dksih/QBM/2022/2/7/2911129309782016/2945848951496704/STEM/1a873fa6-070d-41be-bf30-10059d7118c7.png?resizew=185)
(1)求三棱锥
的体积
(2)求平面
与平面
所成角的余弦值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6569ff154c579d0f3bc2157bbdf53444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0042fbd04367d0df0fba2f59de72aa26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fab4d2a8ab12be628eb2ce03f0ae7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fa63d3e323e0af20561b36a81aab19e.png)
![](https://img.xkw.com/dksih/QBM/2022/2/7/2911129309782016/2945848951496704/STEM/1a873fa6-070d-41be-bf30-10059d7118c7.png?resizew=185)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8040a570a0197daf7d1a7b50c89d9e2.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a06b68dc88cc22301870ad2819a1a2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1910c648c8bfa02218b2802f5bfbacfa.png)
更新时间:2022-03-28 10:47:56
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,几何体是由半个圆柱及
个圆柱拼接而成,其中
,
分别为
与
的中点,四边形
为正方形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/0713acfb-7345-4f8b-b11d-c50aacdab0ff.png?resizew=149)
(1)证明:平面
平面
.
(2)若
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bb3820bab977db734f4335e4fde720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/0713acfb-7345-4f8b-b11d-c50aacdab0ff.png?resizew=149)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12c789d421ca4617429743eeab4568f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/033f38a572e70229ff8ab88e75e140ef.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/366389566438566dc0d6cc26d46edd85.png)
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适中
(0.65)
解题方法
【推荐2】如图,在
中,
,P为
边上一动点,
交
于点D,现将
沿
翻折至
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/8a9365f5-fd24-4bfb-a2e5-ef08bc02456b.png?resizew=166)
(1)
沿
翻折中是否会改变二面角
的大小,并说明理由;
(2)若
,E是
的中点.求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
平面
,并求当平面
平面
时四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b8f015217b0d485e6fd1da3802084c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac8fe4026f1a0745ab9aa9fe64f0e482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4a237d3269ed2ebb073c5741c41915a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/8a9365f5-fd24-4bfb-a2e5-ef08bc02456b.png?resizew=166)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac8fe4026f1a0745ab9aa9fe64f0e482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdcccbe157f2ff20e323716205096514.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36177d3114fd41fa976b7d2ae780f1a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58fb3f6c9c7adfd62c9802aecff8bdc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88d94f16de1e3952535f9c6cd2eae28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4864c21e9664fa9111ede6425b09563a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64abc0befb2318656cdacbb69e575693.png)
您最近一年使用:0次
解答题-证明题
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适中
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解题方法
【推荐1】如图,在三棱锥
中,
底面
.点D,E,N分别为棱
的中点,M是线段
的中点,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/4a950e55-c57f-47d5-8d2c-ea4312f94609.png?resizew=201)
(Ⅰ)求证:
平面
;
(Ⅱ)求二面角
的正弦值;
(Ⅲ)已知点H在棱
上,且直线
与直线
所成角的余弦值为
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9177a42f9ab232822de2b889a572932.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55928df632fc6f2b88a44afe37e5a4e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/119d2453d9262756ef3be3b4b52a762c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/4a950e55-c57f-47d5-8d2c-ea4312f94609.png?resizew=201)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3f1c2d75dc63c9669f3b7b0e1a2ff4.png)
(Ⅲ)已知点H在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9d2abf13c2842f58654abf73c6b4ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b94ab384ee86aed107af8b3bbb1d13b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐2】如图所示,已知在矩形
中,
,
,
平面
,且
.
![](https://img.xkw.com/dksih/QBM/2020/1/5/2370732941107200/2371913607389184/STEM/ad6d15e8ef254963ab0b005526b1221f.png?resizew=179)
(1)问当实数
在什么范围时,
边上能存在点
,使得
?
(2)当
边上有且仅有一个点
使得
时,求二面角
的余弦值大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b85a54db826674e4e9b1911e912d7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://img.xkw.com/dksih/QBM/2020/1/5/2370732941107200/2371913607389184/STEM/ad6d15e8ef254963ab0b005526b1221f.png?resizew=179)
(1)问当实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a51f62c318219789a834d9616bd553f.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a51f62c318219789a834d9616bd553f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f8787d38a2a6f1dbb0581ccff5ff24f.png)
您最近一年使用:0次
解答题-证明题
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(0.65)
【推荐3】如图
,在
中,
分别为
的中点,
为
的中点,
,
.将
沿
折起到
的位置,使得平面
平面
,如图
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/62276dd9-eaa0-4b09-bcba-ff3e6520bc0b.png?resizew=325)
(1)求证:
.
(2)线段
上是否存在点
,使得直线
和
所成角的余弦值为
?若存在,求出
的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0117046e7a37bebe0c7b987a00d2bcb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa2a83fed9bf4cb09d84a980452e346.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7b3e7c7845a0ec3cbac709fda131764.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c42bce098904b241986bb91c65ab33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/62276dd9-eaa0-4b09-bcba-ff3e6520bc0b.png?resizew=325)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e51c4114e94bceb198403c1858b9682.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a261474cc7607d31a6324cb4df9c8896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c741af321a8ddaf387fa661f3920ad84.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
解题方法
【推荐1】已知三棱柱
中,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f88e7df45acca3fc3d3da3370f0c32bc.png)
(1)求证:平面
平面
.
(2)若
,
为棱
上一点,求平面
和平面
夹角的余弦值的最大值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a07f03ebc1b55f61fc729a0b756a3095.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f88e7df45acca3fc3d3da3370f0c32bc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/1/c18b30d5-ec45-47de-b0a8-018e8c4a82d7.png?resizew=191)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df00cdf77ed39ca5a0b305861a693142.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7e3c9e7c05de9838c0c5d762720d3ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1752434352ecb9834eaba9c63fc9abe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f96c673a2381f118ea2d3efc0bca1f3.png)
您最近一年使用:0次
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解题方法
【推荐2】已知斜三棱柱
,
,
,
在底面
上的射影恰为
的中点
,
为
的中点,
.
![](https://img.xkw.com/dksih/QBM/2011/6/2/1570230320988160/1570230326362112/STEM/c0ce258d-e2ff-4d4e-8cf1-d77d19137185.png?resizew=215)
(1)求证:
平面
;
(2)求二面角
余弦值的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97e89a358226b4be8786077a60555c69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209acf15985d1ea1ad86fc4a37e38c0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2befa96c33901247429a833c46eb193.png)
![](https://img.xkw.com/dksih/QBM/2011/6/2/1570230320988160/1570230326362112/STEM/c0ce258d-e2ff-4d4e-8cf1-d77d19137185.png?resizew=215)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d1d2e0f281222a5f289ea4008370aed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56e044cde7a2cb7fdbfc2babc1b370d2.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐3】四棱锥
的底面是边长为1的正方形,
,
,
,
,
为
上两点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/13/22f2533a-7b28-4c1b-ac03-c6805e0109cb.png?resizew=185)
(1)求证:
面
;
(2)求异面直线
与
所成的角;
(3)求二面角
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b44f4120c94cb7176dc31fcac387b32e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe7a201432af0a2f9d21c6803906f5c.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/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef29641cdf182aba272204d985c80d04.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/13/22f2533a-7b28-4c1b-ac03-c6805e0109cb.png?resizew=185)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8ccd4181f956f6e0140bf0ab8f0716.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb2d2f43e119f87ac0ec031f4fd70b4f.png)
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