如图,在四棱锥
中,底面
为正方形,
平面
,
,
为
的中点,
为棱
上一动点.
(1)
在棱
上何处时,可使得
平面
?并证明你的结论;
(2)求证:平面
平面
.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfbaf73297240eb116f22489519895a.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/17/58b45cc1-be6e-47ed-82d2-fd6e4b978dab.png?resizew=155)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6501f1c913a4ef64957a2f01ab5baa15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
更新时间:2023-09-30 21:25:49
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在五面体ABCDEF中,四边形ABCD是矩形,
.
(1)求证:
:
(2)从下面三个条件中选择一个作为已知,使五面体ABCDEF存在.求直线AE与平面BCF所成角的正弦值.
条件①:平面
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
条件②:平面
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
条件③:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7dac702fe64edf1bc265da4b98cf2a0.png)
注:如果选择的条件不符合要求,得0分;如果选择多个条件分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04dee62ab0a09454e3906fbd0d3f14a0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/af0a558d-cb99-475b-9565-df5ed4ffd77f.png?resizew=200)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/333ab24c4935210f4c232cd0c0fae358.png)
(2)从下面三个条件中选择一个作为已知,使五面体ABCDEF存在.求直线AE与平面BCF所成角的正弦值.
条件①:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb5a68a008a22d5a8cea5fe8dcf31e10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
条件②:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
条件③:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7dac702fe64edf1bc265da4b98cf2a0.png)
注:如果选择的条件不符合要求,得0分;如果选择多个条件分别解答,按第一个解答计分.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,长方体
中,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/5/b7c2b5c9-56cb-49de-a1f9-5e4e81e8a988.png?resizew=150)
(1)求证:直线
面
;
(2)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c52ba95a39d97385ac6835b25ddabe6b.png)
(3)求二面角
的余弦值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27db558e8db4c957654c8e5cecd2d2dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/5/b7c2b5c9-56cb-49de-a1f9-5e4e81e8a988.png?resizew=150)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f7f44fa920f5758bc72b182ac9d181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e48e2f18c4c61dfcc908827ac3c8a204.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c52ba95a39d97385ac6835b25ddabe6b.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a175800417614231410d9c86a9c21591.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图所示,在多面体
中,底面
为直角梯形,
,
,侧面
为菱形,平面
平面
,M为棱BE的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/b32fab31-6a6e-403e-9b7d-aaee35b7ea12.png?resizew=175)
(1)若
上有一点N满足
平面
,确定点N的位置并证明;
(2)若
,
,求平面
与平面
所成二面角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.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/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c674dc5024374f53920947c4cf4baf11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/b32fab31-6a6e-403e-9b7d-aaee35b7ea12.png?resizew=175)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78aafccd397e9c88a567abf4993d40f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c1f6300d38aa95f318f59a9f38d01b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2246c0e92e8cc344f636ea8f8f9037e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebce46aeb97373353179e5669365fa4a.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐2】如图,在直角梯形ABCD中,AB∥DC,∠BAD=90°,AB=4,AD=2,DC=3,点E在CD上,且DE=2,将△ADE沿AE折起,使得平面ADE⊥平面ABCE,G为AE中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/26/7e2b4cfc-f4d4-48ec-b5bd-21fcd78288f8.png?resizew=439)
(1)求证:DG⊥平面ABCE;
(2)求四棱锥D-ABCE的体积;
(3)在线段BD上是否存在点P,使得CP∥平面ADE?若存在,求
的值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/26/7e2b4cfc-f4d4-48ec-b5bd-21fcd78288f8.png?resizew=439)
(1)求证:DG⊥平面ABCE;
(2)求四棱锥D-ABCE的体积;
(3)在线段BD上是否存在点P,使得CP∥平面ADE?若存在,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/747978ec67fee6ee9eb07d02b80987d7.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐1】在五面体
中,
,
,
,
,平面
平面
..
![](https://img.xkw.com/dksih/QBM/2018/3/2/1893476813848576/1895106313781248/STEM/dacb72edbc7145b38938ff304472a4a1.png?resizew=181)
(1)证明:直线
平面
;
(2)已知
为棱
上的点,试确定
点位置,使二面角
的大小为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10de2459bc376f9a3de90f74cc18ca7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/def212da83f08df1309c9833521e2a8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b66d0c4532b4e7826e61fa718b28153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb5a68a008a22d5a8cea5fe8dcf31e10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2018/3/2/1893476813848576/1895106313781248/STEM/dacb72edbc7145b38938ff304472a4a1.png?resizew=181)
(1)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b190c8d3d7d7d0e6e959e8a52eae90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa3254460ecbacecb3e57c5dce227f4.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe1df39b6ba5161e0ece93b93887e4b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.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2】在三棱锥
中,已知
是等边三角形,
分别是
的中点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/b29f2823-31f3-4675-b703-17031b2c21f5.png?resizew=189)
(1)证明:
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aabe9e96020185b19868b392fc1e3a70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2855505eaa7d24edecd05ffbd5df6bf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa364dffb98a94fb8285c2cdb9ad14b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b2cc1d0bfd22c88286880b9da1f6f4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/b29f2823-31f3-4675-b703-17031b2c21f5.png?resizew=189)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3769377d3465909f32c98246e6776d9f.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/486aa57b8d51f4bafedf8b31ed0b6452.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐3】如图,直二面角
中,四边形
是边长为2的正方形,
为
上的点,且
平面
,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/29/42c361d7-b0d3-4c6a-9801-e88c9c9a073d.png?resizew=129)
(1)求证:
平面
.
(2)求平面
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d87b527147cb8dbb475bcefc0da2e6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5a50b7c848aa473156eb397bc4d2316.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa3c61d6c19e187b4b824b6f5610cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/29/42c361d7-b0d3-4c6a-9801-e88c9c9a073d.png?resizew=129)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efb49d869110f27140f5c1934143db2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.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】已知
中,
,
,
,
,
为
,
上的动点,且
,将三角形
沿
折起至如图所示,使平面
平面
.
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718899133743104/2720754831990784/STEM/8a17b8f6-b02e-4d3f-a4e9-5adb7f824990.png?resizew=367)
(1)证明:平面
平面
;
(2)求平面
和平面
所成的锐二面角的余弦值的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eddf629bfb2d7b9daea6f2c1553360af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edc6b94f23607ff4261c371ec9425c8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d459cad63e3cd2aba10862800fa4832.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718899133743104/2720754831990784/STEM/8a17b8f6-b02e-4d3f-a4e9-5adb7f824990.png?resizew=367)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a0d238b6e9b49bbea22a79402e8e4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
您最近一年使用:0次
【推荐2】如图,在直三棱柱
中,
为直角,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2021/8/2/2777666716680192/2785331448750080/STEM/3558dbca-f21b-44a3-9518-4379eb4453a1.png?resizew=185)
(1)求证:平面
平面
;
(2)若异面直线
与
所成的角的正弦值是
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d8cb98c0adee7ca698d8b17dacb845b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/2021/8/2/2777666716680192/2785331448750080/STEM/3558dbca-f21b-44a3-9518-4379eb4453a1.png?resizew=185)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a4ba140c31232561fc4183d9cef9010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
(2)若异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c8f19687a166c3022c81a831127dabd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de0ed8fdcbb8da1037f7118679995448.png)
您最近一年使用:0次