如图,
矩形ABCD所在平面,
,M、N分别是AB、PC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/c87dc48f-ec3a-49bd-8eff-1191f01efafb.png?resizew=191)
(1)求证:
平面PCD;
(2)若直线PB与平面PCD所成角的正弦值为
,求二面角N-MD-C的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f6967901d6c855864df01e7bf7a15c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/c87dc48f-ec3a-49bd-8eff-1191f01efafb.png?resizew=191)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93cf663ee2bf1ac5c43f4306fa0cf250.png)
(2)若直线PB与平面PCD所成角的正弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d83fb9ac8a18e78a4c56da79514b5ccb.png)
更新时间:2020-03-28 20:21:23
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相似题推荐
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,在多面体
中,四边形
是正方形,在等腰梯形
中,
,
,
,
为
中点,平面
平面
.
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e89556992cbfd7043330ac7421d342.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e08c14e87a2bcf7090eab2fea73667d2.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/34b746ff2fcb4711ea7c84e67c291935.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10eca594d6a0e6f8b7d9c2b62f9e588f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e27806ef2d85cfa2d3033cbf19e0d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589ddae20626f9aaac616d2a3b5d95bd.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eac1c5a0f095aa9161045531e4ac9f7.png)
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解题方法
【推荐2】如图,在正四棱锥
中,点E,F分别在棱PB,PD上,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f5e0b8070ef28816c417b348fb5fab.png)
.
![](https://img.xkw.com/dksih/QBM/2022/5/20/2983485856006144/2996124922609664/STEM/f4ab32c9-6413-4a92-ba3a-11cb291517e1.png?resizew=267)
(1)证明:
平面PAC;
(2)当
时,请问在棱PC上是否存在点M,使得
∥平面MEF?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f5e0b8070ef28816c417b348fb5fab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bee2973a5b77d5324d68c4ba2a4060b.png)
![](https://img.xkw.com/dksih/QBM/2022/5/20/2983485856006144/2996124922609664/STEM/f4ab32c9-6413-4a92-ba3a-11cb291517e1.png?resizew=267)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5f445af1ae136773cb338920552ff2.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a2a34b4317deffa40ba34e269c2b81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d4838797cff70efabc1e8c1c005e3d6.png)
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【推荐3】如图,三棱柱
中,侧面
底面
,
,
,
,点
是棱
的中点,
,
.
;
(2)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/85a2e10a5aebe40a9018d5ee3ade7af8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1c934996d34643d7ca1df55230d5a4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33c99fc553ecb3e2afdb7058201bc642.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f00f9d78c6df49f58a527aac02be39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cb61907b2cc3430c4100c8f04cd15a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/822ba132ca9dd0d4a050659aef3c9b26.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1803d62a881048bd8ac156c7e5d284df.png)
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解答题-证明题
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名校
解题方法
【推荐1】如图,已知四棱锥
的底面是矩形,
平面ABCD,
,点E是棱AD上的一点,且
,点F是棱PC上的一点,且
.
![](https://img.xkw.com/dksih/QBM/2021/12/27/2881711609856000/2919181869195264/STEM/de1e0a77-f042-4a99-86ab-650871c6056b.png?resizew=181)
(1)求证:
平面PEB;
(2)求直线PC与平面PEB所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e59cfcbbbba20f631e0fd70e3ade6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d315eff37c1bdf5be90b6015b08bdea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3803184b948b8242757d731661387ade.png)
![](https://img.xkw.com/dksih/QBM/2021/12/27/2881711609856000/2919181869195264/STEM/de1e0a77-f042-4a99-86ab-650871c6056b.png?resizew=181)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40f44f2b2f82a9126223138972850aa2.png)
(2)求直线PC与平面PEB所成角的正弦值.
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【推荐2】已知四棱锥
的底面为菱形,
,
,
平面
.
与底面
所成角为
,设平面
与平面
交线为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/a79c0bf4-7132-4e9c-8262-827e141caea6.png?resizew=164)
(1)证明:
平面
;
(2)Q为l上的动点,且点Q与点A在平面
同侧,求直线
与平面
所成角的正弦值的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd7a42341edbc0b01ab0769c4c02c3e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.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/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/a79c0bf4-7132-4e9c-8262-827e141caea6.png?resizew=164)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23976db53f05b3d5d791c4d736a7184d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)Q为l上的动点,且点Q与点A在平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c550269f3199038726f55cbd281c13a.png)
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【推荐1】如图,在
中,
,
,
,
,将点A沿BD折起到点P的位置,点E为PC的中点,点G为
的重心.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/d1e4efb4-4179-4854-92fa-f6be29cfde24.png?resizew=246)
(1)求证:EG不平行于平面PBD;
(2)若
,平面
平面BCD,求二面角B-PC-D的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/775976772e3ec565820397ae8deda0fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eb6bf23a5a12e1ba5413594d7b1a57c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/d1e4efb4-4179-4854-92fa-f6be29cfde24.png?resizew=246)
(1)求证:EG不平行于平面PBD;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1c3ea872a20fdc1843cb5ffce8a554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04c222223dae9ef27d4c132534d9848.png)
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【推荐2】如图,四边形
中,
,
,
,
面
,
,且
.
![](https://img.xkw.com/dksih/QBM/2016/9/12/1573011661340672/1573011666984960/STEM/6a0d7e27-1e62-4394-93a6-73f2c3b5b645.png?resizew=286)
(1)求证:
面
;
(2)若二面角
的大小为
,求
与面
所成角的正弦值.
![](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/76e40cb941cea512980ead6906660d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c116d5b8109a9ea53f6ad8fcf2dfa48d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f22f3143a34f1f78bc5ef35c24d4beb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae505f23e661552ddd64445206d8de3b.png)
![](https://img.xkw.com/dksih/QBM/2016/9/12/1573011661340672/1573011666984960/STEM/6a0d7e27-1e62-4394-93a6-73f2c3b5b645.png?resizew=286)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac39b7f1de83c517272fddb54caec27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6967e3578fc16fc4baf0898f83be3da0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐3】如图,在三棱锥
中,
,
为
中点.
(1)求证:
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)在线段
上是否存在一点
,使二面角
的平面角的余弦值为
?若存在,确定
点位置;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91fd684119cd366c5c024da2be7e7344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d30637da200a07672ae231b4c5c09cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd9bd54c25b35857e6b602291f9b6062.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83303d3784492506fc44f2b4d6b07bc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2011/7/20/1570269026082816/1570269031669760/STEM/87f1cdc47fa342958ad2ad23f3db9b1b.png?resizew=238)
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