如图,在直三棱柱
中,
平面
,其垂足D落在直线
上.
![](https://img.xkw.com/dksih/QBM/2020/7/22/2511316937842688/2511986279546880/STEM/875a783a-b44e-4336-81b5-cd389cdcb4b2.png)
(1)求证:
;
(2)若P是线段AB上一点,
,
,三棱锥
的体积为
,求二面角
的平面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a211ad5a06b505b8365a62c1946f3cb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://img.xkw.com/dksih/QBM/2020/7/22/2511316937842688/2511986279546880/STEM/875a783a-b44e-4336-81b5-cd389cdcb4b2.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b4cdc3a083d1263634d510f172dab09.png)
(2)若P是线段AB上一点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf9ad150cb1e4cd8977d4cc3d99be17c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/283c8668ca30b171ee4352452e1c7e94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e6d761c7fd9b42e8d8701351c76650d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a38c066a0b26bed54ae17f4e998ed3.png)
更新时间:2020-07-23 11:12:04
|
相似题推荐
解答题-问答题
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适中
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解题方法
【推荐1】如图,已知四棱锥
中,底面
为直角梯形,
,
,
,
平面
,
,
分别是
,
的中点.
(1)证明:
;
(2)若
,求点
到平面
的距离.
![](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)
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![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/304e9d63e7fdc531f4f7b805b765a1b1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81981fd7b343f4fe2db8f36eb66c1ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/d0bcce1a-3ab9-4f2f-97b1-0c049b00edeb.png?resizew=168)
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【推荐2】如图,
中,
,
,
,
,
,
.
(1)若
与平面
成
角,求此时
与平面
所成的角的正弦值;
(2)求
长的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/571ef38fc225d102bcd4f35bab70078c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85ec4c741f628ccd5aaae4215e55d76a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eea78bf026d76f1cb9cc3dc9349a193.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bce1f7cbff1af5bab77210ca775c4154.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ccfd81d120348601cd611241d1a5dc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c5757f787d98f9a46777324b69ad672.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://img.xkw.com/dksih/QBM/2017/10/26/1803690576961536/1804519104045056/STEM/4db66377044f4080aca0eff07f3abbd3.png?resizew=172)
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【推荐1】在四棱锥
中,底面ABCD为长方形,
底面ABCD,
,
;
的可能取值为:①
;②
;③
;④
;⑤
.已知线段CD上存在点E,满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/934913af-9574-4efa-929b-bcc633837b92.png?resizew=175)
(1)求t的所有可能取值,并说明理由;
(2)当t为所有可能取值的最大值时,线段
上满足
的点有两个,分别记为
,
,求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a0367c3fe3c5c5dfefec87f641bbde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a60d188df4133c78bcc45a809f3009cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c19215074e16c7288e853d336897bead.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3137f547ed45102f2756dc127fa58a00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e253df620ebe2d36dc34cb1f87117da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/784b0525cd7c98f33e1124077f523b9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66884efff7400f92b530d69d029778d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eeae8261be189add1f2f1ea77975861.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/934913af-9574-4efa-929b-bcc633837b92.png?resizew=175)
(1)求t的所有可能取值,并说明理由;
(2)当t为所有可能取值的最大值时,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eeae8261be189add1f2f1ea77975861.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/522230546d4b802094e86ceb48c2ba38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4f150ab98bde511e0f65d9bafab031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c9d346ba06765d4788b32d90554410.png)
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【推荐2】如图,在四棱锥
中,四边形
是正方形,
是等边三角形,平面
平面
分别是棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/7fe12875-a1e4-4787-b96e-44c16287ef82.png?resizew=191)
(1)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
平面
.
(2)求平面
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/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58bf40f6235d0231481c2598e2ba977b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47891397990336f55f96bd66d367758b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/7fe12875-a1e4-4787-b96e-44c16287ef82.png?resizew=191)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fbbe7f48676298f2ee0cb1901992eaf.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fbbe7f48676298f2ee0cb1901992eaf.png)
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【推荐3】如图,已知在正三棱柱ABC-A1B1C1中,AB=2,AA1=3,D,E分别在CC1与AA1上,AE=2,CD=1.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/c584240e-c295-4d15-8be0-93d48e46a5b2.png?resizew=153)
(1)在线段BE上找一点P使得DP⊥平面ABB1A1,并写出推理证明过程;
(2)求平面
与平面BEA夹角的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/c584240e-c295-4d15-8be0-93d48e46a5b2.png?resizew=153)
(1)在线段BE上找一点P使得DP⊥平面ABB1A1,并写出推理证明过程;
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f029657e8779110789e6159934460282.png)
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