如图,三棱柱
的侧棱长为
,底面是边长为2的等边三角形,
分别是
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/17/b0a25a64-e781-41f7-b397-ec5b3b0fe5b4.png?resizew=221)
(1)求证:侧面
是矩形;
(2)若
,求直线
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64f8f6bad19ae6e30ebb0128a55b9292.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/17/b0a25a64-e781-41f7-b397-ec5b3b0fe5b4.png?resizew=221)
(1)求证:侧面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff17d7f919fdf98e492587fc493b8d6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c6047bccff2f60152b8656ca3b52228.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62a52848aff08399a36f217356007a4b.png)
更新时间:2023-01-14 17:37:57
|
相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图,在平行四边形
中,
,
.点
,
分别在边
,
上,点
与点
,
不重合,
,
与
相交于点
,沿
将
翻折到
的位置,使二面角
为90°,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/9f4b11ba-bc10-4a49-a236-6b982631964f.png?resizew=265)
(1)请在下面两个条件:①
,②
中选择一个填在横线处,使命题
:若________,则
平面
成立,并证明.
(2)在(1)的前提下,当
取最小值时,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3f8b5c2dba20d42a8c551cd75a38fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bde5e96c203f387b2004b4abf5f839f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d048050a43df537a5e2b18fad0a4213e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/863ff2bbb8fa034fbaa47f5ccd9dbc55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/9f4b11ba-bc10-4a49-a236-6b982631964f.png?resizew=265)
(1)请在下面两个条件:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8915e8e775538d41debf1933102c6b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e2cdaaf2a9bc82cba32adaa88534bdc.png)
(2)在(1)的前提下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65277734669566578cbb7d690bb200fb.png)
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【推荐2】如图,在四棱锥
中,底面四边形
是正方形,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/4babfa95-6579-4869-a480-77b1a6978335.png?resizew=151)
(1)证明:
平面
;
(2)已知
,点
是棱
上的点,满足
,若二面角
的余弦值为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c993785b28c10828aef90c84bc99f807.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc50067f63e524f638e2464bfa6ed73.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/4babfa95-6579-4869-a480-77b1a6978335.png?resizew=151)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb2e071d4e01107dcf7d95cbb86b415.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6ca1657d0a026d2970542828f7bac87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defa5b53043ae802bb1af7d14374406d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5d35a27c510d1ee953622996d49e3b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbeab80976db9b4689b9446cda06196a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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【推荐3】如图,在直三棱柱
中,E为
的中点;点F在
上,且
.
(1)证明:
;
(2)若
,
,
,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/059be9e694ddd66a70f10c9eb18b6ce9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/15/095697dc-7213-4410-af64-91699f8fb9de.png?resizew=117)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc7dff8bbb494506f25815c5da179b1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9f987e6268a1427d0e2d4f2d8835eb3.png)
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【推荐1】如图,四棱锥
的底面为平行四边形,且
,平面
平面
,
,
与平面
所成角的正切值的比值为
.
![](https://img.xkw.com/dksih/QBM/2021/5/18/2723898427408384/2723957684183040/STEM/32a1934f-2644-4272-8d33-32887d14ebd7.png?resizew=260)
(1)求证:
;
(2)若
,
,
,点
为
的中点,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.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/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2021/5/18/2723898427408384/2723957684183040/STEM/32a1934f-2644-4272-8d33-32887d14ebd7.png?resizew=260)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0063f3f48e49f2970ec7f097567cef5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c7d7d693a0814da54758bbd923e605b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0f2fee2a7ab65e62a1710323dc30e09.png)
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【推荐2】如图1,梯形ABCD中,AB∥CD,过A,B分别作AE⊥CD,BF⊥CD,垂足分别为E、F.若 AB=AE=2,CD=5,DE=1,将梯形ABCD沿AE,BF折起,且平面ADE⊥平面ABFE(如图2).
![](https://img.xkw.com/dksih/QBM/2021/2/24/2664995985612800/2678992010420224/STEM/79e5a3a9-16e0-42e9-ba98-272c0f25fbe1.png)
![](https://img.xkw.com/dksih/QBM/2021/2/24/2664995985612800/2678992010420224/STEM/8c807d15-418d-4987-920e-370a6d3dc443.png)
(Ⅰ)证明:AF⊥BD;
(Ⅱ)若CF∥DE,在线段AB上是否存在一点P,使得直线CP与平面ACD所成角的正弦值为
,若存在,求出 AP的值,若不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/2021/2/24/2664995985612800/2678992010420224/STEM/79e5a3a9-16e0-42e9-ba98-272c0f25fbe1.png)
![](https://img.xkw.com/dksih/QBM/2021/2/24/2664995985612800/2678992010420224/STEM/8c807d15-418d-4987-920e-370a6d3dc443.png)
(Ⅰ)证明:AF⊥BD;
(Ⅱ)若CF∥DE,在线段AB上是否存在一点P,使得直线CP与平面ACD所成角的正弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fa1f94ae438ef46686a8d51d69df0f7.png)
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解题方法
【推荐1】如图,
为三棱锥
的高,
,
在棱
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/ce54882f-1e55-44ac-b73a-7f859eb9689c.png?resizew=204)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
平面
;
(2)若
,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f39239bc56503d13548360e21777654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d61a01b39577c08d46f3d9550570b1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f68184ccf2ee70eb5b4f037f58fa06b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/ce54882f-1e55-44ac-b73a-7f859eb9689c.png?resizew=204)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe5af35ee6dd26a36845366e29f30ef3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c2898853a3396f0878af9eac934416d.png)
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【推荐2】如图,在多面体ABCDEF中,平面
平面ABCD,四边形CDEF是矩形,四边形ABCD是平行四边形,
,
,G,H分别为CF,DE的中点.
(1)证明:
平面BDE;
(2)求二面角
的平面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb5a68a008a22d5a8cea5fe8dcf31e10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c642331515a1930624bb6ab985178af.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/88869005-0b75-40c0-bdf7-c9e8acb3e032.png?resizew=121)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d07d16fc91aa960b67ba4b474de8a62.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9720e871b00cf2b328a7cbf764c3b19a.png)
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解题方法
【推荐1】如图,在直三棱柱
中,
是
的中点,
是
的中点,
是
与
的交点.
与平面
所成角的正弦值;
(2)在线段
上是否存在点
,使得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
平面
?若存在,求出线段
的长;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e50114cea5086012c078e0755175db2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0ff310aabd2282b539537ebed3f788.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4e7552a39c412d882766dbcd7eeb69.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a604466a9c8d10d557b3dfc43b547065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4e7552a39c412d882766dbcd7eeb69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
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解题方法
【推荐2】如图所示,等腰梯形ABCD中,AB∥CD,AD=AB=BC=2,CD=4,E为CD中点,AE与BD交于点O,将△ADE沿AE折起,使点D到达点P的位置(P∉平面ABCE).
![](https://img.xkw.com/dksih/QBM/2022/9/19/3069981656170496/3071122050252800/STEM/5439c88afb394b61b5f9cd76bf4d0be9.png?resizew=385)
(1)证明:平面POB⊥平面ABCE;
(2)若PB
,试判断线段PB上是否存在一点Q(不含端点),使得直线PC与平面AEQ所成角的正弦值为
,若存在,求出
的值;若不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/2022/9/19/3069981656170496/3071122050252800/STEM/5439c88afb394b61b5f9cd76bf4d0be9.png?resizew=385)
(1)证明:平面POB⊥平面ABCE;
(2)若PB
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a88baedfc1deeee9e85138abddfdd000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83303d3784492506fc44f2b4d6b07bc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d675fca424a449157227c54b9e4de75c.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐3】如图所示,在四棱锥
中,侧面
底面
,侧棱
,
,底面
为直角梯形,
,
,
.
为
的中点.
![](https://img.xkw.com/dksih/QBM/2022/10/10/3084527691022336/3094445129089024/STEM/75c9773d321e4e95bca48a662c2e4ecb.png?resizew=238)
(1)求证:
平面
;
(2)求直线
与平面
所成角的正弦值;
(3)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4db3940f180ba6947c2edcfaf4431e42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a13c39ce0233e097dd6da8437a6957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/354753c357a73c6ff771145c43d0a0d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b1fad9084b78550832471412cf10bd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5acb763021bf166ca719d07223591d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48b45243602cc643b5f47e03f7c8c046.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c2b20aabf1834a48bb94783fae7403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/701f3b0e2bedfe5195443459072d798e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/2022/10/10/3084527691022336/3094445129089024/STEM/75c9773d321e4e95bca48a662c2e4ecb.png?resizew=238)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0605aaaf669a3bd1f8d48f68580d2b09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(3)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb5255e2159617505e0c87d01437a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次