如图,三棱柱
中侧棱与底面垂直,且
,AB⊥AC,M,N,P分别为
,BC,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/f3af5590-c08d-40c4-92e7-a33fcfaa25fd.png?resizew=149)
(1)求证:PN∥面
;
(2)求平面PMN与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9d2462e6dbd321cf3abae25a56adf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc916a3eb3cabc632e7c894320d5e412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/f3af5590-c08d-40c4-92e7-a33fcfaa25fd.png?resizew=149)
(1)求证:PN∥面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
(2)求平面PMN与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
更新时间:2022-12-08 00:00:20
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相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,四棱锥P﹣ABCD中,PA⊥平面ABCD,底面ABCD为直角梯形,∠ABC=∠BAD=90°,AD>BC.E,F分别为棱AB,PC上的点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/a2d8e943-81b4-448b-ad27-a5b321ff0104.png?resizew=231)
(1)求证:平面AFD⊥平面PAB;
(2)若点E满足
,当F满足什么条件时,EF∥平面PAD?请给出证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/a2d8e943-81b4-448b-ad27-a5b321ff0104.png?resizew=231)
(1)求证:平面AFD⊥平面PAB;
(2)若点E满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7236f027c492eaaa05a6fbfca17e854.png)
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解题方法
【推荐2】三棱柱
的棱长都为2,D和E分别是
和
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/24/3afad949-d5f9-4337-a9f2-0d0da9a7a9d2.png?resizew=217)
(1)求证:直线
平面
;
(2)若
,点B到平面
的距离为
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/24/3afad949-d5f9-4337-a9f2-0d0da9a7a9d2.png?resizew=217)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea848cd2aa3a464618020475097949fc.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7e3c9e7c05de9838c0c5d762720d3ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a57dfb78e8579cc68dbfca90f80a1c5.png)
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解答题-问答题
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解题方法
【推荐1】如图,在直三棱柱
中,
,点
分别在棱
上,
为
的中点.
内,过
作一条直线与平面
平行,并说明理由;
(2)当三棱柱
的体积最大时,求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72f9a12befb000adad1ffe56025ba831.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e86e3991200297ad172455e5ea93f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28cdc44ef71034084b13630d363acc4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
(2)当三棱柱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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名校
解题方法
【推荐2】如图,在四棱锥
中,底面
是矩形,
平面
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/4da958b0-05c5-4ad6-89c1-d4de2381a16b.png?resizew=180)
(1)求二面角
所成平面角的余弦值;
(2)点
在
上,且直线
与平面
所成的角的正弦值为
,确定点
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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/4da958b0-05c5-4ad6-89c1-d4de2381a16b.png?resizew=180)
(1)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1069d514c3c32aeabd274475ee209ed6.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24c14ff9b66f21c05e52dc3c8908c2df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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解题方法
【推荐1】如图所示,四棱锥
中,四边形
是矩形,平面
平面
,
,点
是线段
的中点,点
在线段
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/d480103b-fb87-4502-af87-0eef2e5ac68e.png?resizew=172)
(1)求证:
平面
;
(2)若
,平面
与平面
所成的二面角为
,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/235d1553f6806c1eee3b17b94d23f0f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d75067992dac86e97172428a50a001e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2bc5e50b8dfa02601c70822252854a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4db9b82b67efe45a02fca32bfcf5dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/062e7c94a945779095f74465256a4690.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/d480103b-fb87-4502-af87-0eef2e5ac68e.png?resizew=172)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9428c4a6a25d360a036aaf0a92e40988.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af29254fe60a392c249c5791279e9c8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d383339db122e59a1d9399af7f49e843.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/193b5b41994c2a4dfa5bb0bc984061cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44ae9ad9b97da2cea2071668ead7ed8a.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,
平面
,
,
,
为
的中点,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/e303ffd3-dd19-4f7b-b1ee-1572584c00eb.png?resizew=166)
(1)求证:
平面
;
(2)求证:
平面
;
(3)设
为棱
上一点
,试确定
的值使得二面角
为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6bc6221696099961b691e0d41e39232.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.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/90b29dabee6ab29c1bb1e27e0cb5b7df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2899e607479d8d1c47d954ae9ebb7144.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/e303ffd3-dd19-4f7b-b1ee-1572584c00eb.png?resizew=166)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b78172568aac9805d2ea2d5f742bf80c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a3f50bdf801b37c9a03e7bbf6262d92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91c62443394b66c32e1676522487d725.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
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【推荐3】如图所示,四棱锥
中,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/c2ec5065-0279-4900-a797-197de8aafac9.png?resizew=184)
(1)求证:
平面
;
(2)若点
是线段
上的动点,平面
与平面
所成锐二面角的余弦值为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a0e5697eca3f5205cb7b343648240bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac410282dc087b847b82ca946898d38f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3d1a4a5b5edda0a3fcf598a7a6d1ecc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/c2ec5065-0279-4900-a797-197de8aafac9.png?resizew=184)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5000fea066102e62cf2128ccbbd2b3e3.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2bc5e50b8dfa02601c70822252854a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf2f0df53aa68c9c334165034788166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5000fea066102e62cf2128ccbbd2b3e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147567c35a9527de9e56192583da0891.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
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