如图,四边形
由边长为2的等边
、等边
以及等边
拼接而成,现沿
进行翻折,使得平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/0cc05a5d-35fe-404c-887c-de4564c88a43.png?resizew=191)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/51568386-7714-49ba-a7ed-47ee896e7200.png?resizew=264)
(1)求证:
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5410cf06cbfeaaf5818e0a606aedc1eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25df618ec33cee978f79d2eae62024f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df6d51738ac1bc8b9530ea4a55745c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448cbac9a1ef3de7538a6b30cdc39582.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/0cc05a5d-35fe-404c-887c-de4564c88a43.png?resizew=191)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/51568386-7714-49ba-a7ed-47ee896e7200.png?resizew=264)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae368b7b43ff9b6cdbed1709ebee583e.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2bc5e50b8dfa02601c70822252854a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5000fea066102e62cf2128ccbbd2b3e3.png)
更新时间:2020-03-14 11:49:22
|
相似题推荐
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图①,在直角梯形
中,
,
,
,
,
、
分别是
,
的中点,将四边形
沿
折起,如图②,连结
,
,
.
![](https://img.xkw.com/dksih/QBM/2022/4/13/2957152542466048/2957342904442880/STEM/35532372-4f29-4c3c-a7d2-c76399e571e7.png?resizew=360)
(1)求证:
;
(2)当翻折至
时,设
是
的中点,
是线段
上的动点,求线段
长的最小值.
![](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/c30f6595dd643813b11ad71df61a10dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89c41757ae282475fb29ec1e8e02045d.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2022/4/13/2957152542466048/2957342904442880/STEM/35532372-4f29-4c3c-a7d2-c76399e571e7.png?resizew=360)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1a1fd2fc33e89f357cef772ff6cd0e.png)
(2)当翻折至
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9538281f10aa8129a3d0cc49a0370db5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/7a5f1641947153c80b987320885a2b57.png)
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【推荐2】如图,在四棱锥
中,底面
为矩形,
平面
,
为棱
的中点,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/921df158-ee9e-49c0-b042-36ff84574f82.png?resizew=223)
(1)证明:
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/5a1b49f64e0065edad868b25e9fcada3.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/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8825d400f453c5c17a7beeb1cc9a9cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bec03e804f0cea1db5cde2aa185056a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d5942a81561bf6617281126e97e5595.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/921df158-ee9e-49c0-b042-36ff84574f82.png?resizew=223)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/502f49e759b623b5c3a8b901bb9882cc.png)
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【推荐3】如图,棱雉
的底面
是正方形,
平面
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/19/cc935838-02fb-47dd-b55e-74d1eca53ba9.jpg?resizew=133)
(1)求证:
平面
;
(2)求直线
与平面
夹角的正弦值.
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/19/cc935838-02fb-47dd-b55e-74d1eca53ba9.jpg?resizew=133)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.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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【推荐1】如图,四棱锥
中,
平面
,
,且
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/c599b562-d198-4f15-b774-03251efaa82e.png?resizew=159)
(1)求证:
平面
;
(2)求
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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae1e04eeb4de72e5750dae77bcb6f88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69c2c003b0954b99d2a1a20ce2c4a3a8.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/2022/11/8/c599b562-d198-4f15-b774-03251efaa82e.png?resizew=159)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/932a04304f2d4975955d4baabb2deeea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次
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适中
(0.65)
【推荐2】如图,在三棱锥
中,
是边长为2的正三角形,
,
,
,D为
的中点.
![](https://img.xkw.com/dksih/QBM/2022/4/7/2953183833513984/2953804695052288/STEM/1b8c332038e84451a52655f982b2cb26.png?resizew=217)
(1)证明:
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81681f4f098511de0da54271f2b42a23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc47149bbe576ab218de45b3b7cafed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a0367c3fe3c5c5dfefec87f641bbde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2022/4/7/2953183833513984/2953804695052288/STEM/1b8c332038e84451a52655f982b2cb26.png?resizew=217)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4cd8ba7eb52e38857830162e770f534.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
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【推荐3】如图所示的五面体中,A1A,B1B,C1C都与底面ABC垂直,且∠ABC=120°,A1A=8,C1C=2,AB=BC=B1B=4.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/e1d48e20-51d0-4e93-98fc-cd1b888ddace.png?resizew=201)
(1)证明:B1A⊥平面A1B1C1;
(2)求直线AC1与平面CBB1所成的角的正弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/e1d48e20-51d0-4e93-98fc-cd1b888ddace.png?resizew=201)
(1)证明:B1A⊥平面A1B1C1;
(2)求直线AC1与平面CBB1所成的角的正弦值.
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【推荐1】如图,在四棱锥P-ABCD中,已知底面ABCD为菱形,平面PAB
底面ABCD,M为棱BC上异于点C的一点,O为棱AB的中点,且
,
.
,求证:M为BC的中点;
(2)若平面POM与平面PAC所成的锐二面角的余弦值为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/232edea8503a87dff36507c023d3d786.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa2a33608f10886dc3e90e5ade3a5b90.png)
(2)若平面POM与平面PAC所成的锐二面角的余弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83303d3784492506fc44f2b4d6b07bc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9139251b27b393fcb37577828bbf53bf.png)
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【推荐2】如图,四棱锥P-ABCD中,AB=AD,△BCD是正三角形,PB=PD.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/f17362a5-93ac-4b26-8b7d-f59c4dd5210d.png?resizew=161)
(1)证明:平面PBD⊥平面PAC;
(2)若四棱锥P-ABCD的体积为
,
,BC=2,PD⊥BC,求二面角A-PB-C的正弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/f17362a5-93ac-4b26-8b7d-f59c4dd5210d.png?resizew=161)
(1)证明:平面PBD⊥平面PAC;
(2)若四棱锥P-ABCD的体积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ac1cafa010bf62459ecc36a1a23fef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eee296a7d9fba487f1485c61580196f.png)
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【推荐3】在三棱柱ABC﹣A1B1C1中,侧面ABB1A1为矩形,AB=2,AA1=
,D是AA1的中点,BD与AB1交于点O,且CO⊥平面ABB1A1.
![](https://img.xkw.com/dksih/QBM/2016/7/15/1572919506624512/1572919512834048/STEM/ca8262e1-dc8c-4f49-82c2-47772d939723.png?resizew=253)
(1)证明:BC⊥AB1;
(2)若OC=OA,求直线CD与平面ABC所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://img.xkw.com/dksih/QBM/2016/7/15/1572919506624512/1572919512834048/STEM/ca8262e1-dc8c-4f49-82c2-47772d939723.png?resizew=253)
(1)证明:BC⊥AB1;
(2)若OC=OA,求直线CD与平面ABC所成角的正弦值.
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