如图,在三棱柱
中,平面
平面
,
,
,
为棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/cee7a7be-de0b-4532-a734-18422ceadea7.png?resizew=141)
(1)证明:
;
(2)求三棱柱
的高.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61cdaadeae37736a1e6dd93fa1fe712f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8fba6dc92460fa44832398fd2868940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4285e6b41d7c9f04e6d562dc9f514400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/cee7a7be-de0b-4532-a734-18422ceadea7.png?resizew=141)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea9a1c949c2bb591c1db240d7874b089.png)
(2)求三棱柱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
更新时间:2020-02-23 18:02:47
|
相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图,在四棱锥
中,底面
为矩形,
平面
,
,点E,F分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/2021/10/27/2838581317296128/2840556771057664/STEM/bb15915ee628412b9b2b8ba8db0858f6.png?resizew=204)
(1)证明:
平面
.
(2)若
,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/f95475bfc06e884754eb4a455c3f434e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a109c829d652632a88ade6924fcda206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://img.xkw.com/dksih/QBM/2021/10/27/2838581317296128/2840556771057664/STEM/bb15915ee628412b9b2b8ba8db0858f6.png?resizew=204)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2b4e753ef119608188c46a50ec597e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/585288e61871608f6ff8f7e4a0beafbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b115316e0fcd2ef46a4dd383472996e4.png)
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【推荐2】如图,四棱锥
的底面
为直角梯形,
,且
,
,
,平面
底面
,
为
的中点,
为等边三角形,
是棱
上的一点,设
(
与
不重合).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/93741cae-0f2c-4710-a8d2-ae75138e8c6b.png?resizew=199)
(1)当
时,求三棱锥
的体积;
(2)若
平面
,求
的值.
![](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/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5729dd997ea7e8cb4cef8b7165b36e00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/479bb5e937f4fdb1fcbca229e62e0e80.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e2903ff33266528a7902ad51cf8d75.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/d4f605a478c6412c82da1250cbe35c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/93741cae-0f2c-4710-a8d2-ae75138e8c6b.png?resizew=199)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1083037647bea853ab5b73118f27ddd2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/373f735f0f04d11f1951eaef1bb78b6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f8d4dc8f1c33bfbdadbfb2b8d75cc6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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解答题-证明题
|
适中
(0.65)
名校
【推荐1】已知四棱柱ABCD﹣A1B1C1D1的底面是边长为2的菱形,且∠BAD
,AA1⊥平面ABCD,AA1=1,设E为CD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/2424617d-221a-4952-be43-6f7a233a8565.png?resizew=181)
(1)求证:D1E⊥平面BEC1;
(2)点F在线段A1B1上,且AF∥平面BEC1,求平面ADF和平面BEC1所成锐角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b3052da2d1bc23ddce31da1fbe42a6f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/2424617d-221a-4952-be43-6f7a233a8565.png?resizew=181)
(1)求证:D1E⊥平面BEC1;
(2)点F在线段A1B1上,且AF∥平面BEC1,求平面ADF和平面BEC1所成锐角的正切值.
您最近一年使用:0次
解答题-问答题
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适中
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【推荐2】如图,平面
平面
,
是等边三角形,D为
的中点,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/4452860f-ffc8-486c-93d9-60109ab26ae8.png?resizew=144)
(1)证明:
;
(2)在
上是否存在一点P,使得二面角
为直二面角?若存在,求出点P的位置;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5f0cfc1049f84a04c81bd213afb8d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aca839865ff4d94b86f168c8fb265de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b416f0f5b52352b5091d41dcd37ebef1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89e9587d41f7ce4bfd57d79cf939a631.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/4452860f-ffc8-486c-93d9-60109ab26ae8.png?resizew=144)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6870026fcfde41e27f9a7871fdae95d0.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df6aaed07f0b69eee41de11613fc74de.png)
您最近一年使用:0次
【推荐1】在三棱锥
中,
平面
,
,
,点
在棱
上且是
的外心,点
是
的内心,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/39638535-f51b-4e2f-915b-053b29da4080.png?resizew=168)
(1)求证:平面
平面
;
(2)求点
到平面
的距离.
![](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/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45224f7eac9d0cef64bf28d93e7721a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89a9c9c14366b45e71105a07f3775bb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f83a04565a8ebaa111894b724b0ba266.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/39638535-f51b-4e2f-915b-053b29da4080.png?resizew=168)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a45fd0b63ff6f429b236ad8939cb22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/406d58f040d40a6c70e66510156a7f80.png)
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解答题-证明题
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适中
(0.65)
名校
【推荐2】如图1,在直角梯形
中,
,
,且
.现以
为一边向形外作正方形
,然后沿边
将正方形
翻折,使平面
与平面
垂直,
为
的中点,如图2.
![](https://img.xkw.com/dksih/QBM/2018/6/4/1959861774082048/2022246740353024/STEM/8f4f0df92d1447fc9bb037323dd51878.png?resizew=240)
(1)求证:
平面
;
(2)求证:
平面
;
(3)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0046177466c78f08d45449dc5639bf38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://img.xkw.com/dksih/QBM/2018/6/4/1959861774082048/2022246740353024/STEM/8f4f0df92d1447fc9bb037323dd51878.png?resizew=240)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae0d2ea2af3f0ab189c4694eeb52ce43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9a814b70236a108be5d6e7ff271fe92.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1601b174c1c0d24b6bc9fbb96c3d701.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图所示.在四棱锥
中,底面
为菱形,
为正三角形,点
分别是棱
的中点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/12fb11fd-2f1c-4a0f-a3b9-d80b0c30aed9.png?resizew=228)
(1)证明:
平面
;
(2)若
是棱
上一点,且三棱锥
的体积是三棱锥
体积的
倍,求
点的位置.
![](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/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7835c72d14f9d61b95b15aa47fafac2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5461e35659c80e373b30f9dc0c5ccdae.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/12fb11fd-2f1c-4a0f-a3b9-d80b0c30aed9.png?resizew=228)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db807b09cc550f476b3f8fa0c6a14425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e682db81a82443f63a567eb29f4aa7bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16fd1bc6147d69777b26a35d48522f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,四棱锥
中,平面
平面ABCD,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/31/cba66cf6-976d-4c41-b83d-a29005f0e4ad.png?resizew=166)
(1)求证:
;
(2)若
,且平面PAC与平面PBC夹角的余弦值
.求PC的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c9744f5370a14dd0af7ab3f6c18585d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7fba82dd47346b4415b5a42fd8e3e4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/31/cba66cf6-976d-4c41-b83d-a29005f0e4ad.png?resizew=166)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5d56d8170b764b80a672cd6c861921.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/036de574712cad14bddadf6653c7e714.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dedfba8b9447a4db53baae62fdeebfd.png)
您最近一年使用:0次