已知直三棱柱ABC-A1B1C1中,AB=AC=AA1=1,M,N分别为A1C1,AB1的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/5d1285ca-da49-4acd-8fb8-077076b47bd4.png?resizew=134)
(1)求证:MN//平面B1BCC1;
(2)若P是B1B的中点,AP⊥MN,求二面角A1-PN-M的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/5d1285ca-da49-4acd-8fb8-077076b47bd4.png?resizew=134)
(1)求证:MN//平面B1BCC1;
(2)若P是B1B的中点,AP⊥MN,求二面角A1-PN-M的余弦值.
2021·福建·模拟预测 查看更多[2]
更新时间:2020-10-09 11:08:41
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图所示,四棱锥
中,
底面
,
,
,
,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/45b7e0d0-90d0-4ad8-9927-3bcc6281dd6f.png?resizew=186)
(1)求证:
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f51a4b0c34bf6e17ed63d1968659daf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1f52ee69f7e9bc01b1ed57a8c922b33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d4746df85049d1651d3f6c30212a7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da23aac24dd8871f88cfe94f58ae287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/45b7e0d0-90d0-4ad8-9927-3bcc6281dd6f.png?resizew=186)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/963a91995abd4927d75406d16e10a81f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ea440fcc8f186f5de9105b18e152152.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defa5b53043ae802bb1af7d14374406d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21665d21bbfb04410c78345de1fd15ae.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐2】如图,在四棱锥P-ABCD中,底面ABCD为梯形,BC∥AD,E为侧棱PD的中点,且BC=2,AD=4,求证:CE
平面PAB.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/20/2b63f41d-3070-4a4b-bbe2-36a53016eccb.png?resizew=140)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐3】如图,在四棱锥
中,
平面
平面
,
是
的中点,
是
上一点,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a6d56f486865155f01cde58e9111ef.png)
![](https://img.xkw.com/dksih/QBM/2020/6/16/2485729660067840/2486051846004736/STEM/6a83d5f5d4d643c08ed6c9844aaee7b2.png?resizew=199)
(1)求证:
平面
;
(2)若
求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0465d52848d924b0576172c9b22a831.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.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/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a6d56f486865155f01cde58e9111ef.png)
![](https://img.xkw.com/dksih/QBM/2020/6/16/2485729660067840/2486051846004736/STEM/6a83d5f5d4d643c08ed6c9844aaee7b2.png?resizew=199)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ff104e4b07be1e19f3a2744ff8bf5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
解题方法
【推荐1】如图,在直四棱柱
中,各棱长都为3,AC的长为
,F为棱
上一点,BF=1,连接AF,
.
![](https://img.xkw.com/dksih/QBM/2022/2/3/2908497435222016/2916968515985408/STEM/617d2d0d-a32d-4d7f-8a4a-7bf874e26114.png?resizew=137)
(1)作出平面
与底面
的交线,写出作法,并证明:平面
平面
.
(2)求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adbd3e8cf8325999cde03adf845d3dd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/456175ea34492f0bc025aaab668fa659.png)
![](https://img.xkw.com/dksih/QBM/2022/2/3/2908497435222016/2916968515985408/STEM/617d2d0d-a32d-4d7f-8a4a-7bf874e26114.png?resizew=137)
(1)作出平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2b4e62e036522cbbd9778e69bca4bc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac7e0a76186e549951b65b9edfa30ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2b4e62e036522cbbd9778e69bca4bc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b724168afaee2ecddf97257180be18.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,三棱锥
中,点
在底面的射影
在
的高
上,
是侧棱
上一点,截面
与底面
所成的二面角的大小等于
的大小.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/18/16de91fa-4a6c-41fc-9946-df56d5a2dc94.png?resizew=193)
(1)求证:
平面
;
(2)若
,求平面
与平面
所成夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](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/0c606f78391198b6648ba0b92b60f8cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30d59283eb55b461ac1347e8ef446048.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/18/16de91fa-4a6c-41fc-9946-df56d5a2dc94.png?resizew=193)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c606f78391198b6648ba0b92b60f8cf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9b71c4d427e399fe9e9f8056fd3951.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4d781525777c7b5284dffc70b2a28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb5255e2159617505e0c87d01437a57.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐3】如图,在四棱锥
中,侧面
底面
,底面
是平行四边形,
分别为线段
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/d12c361d-2eae-4ba7-8d9a-e752164b7865.png?resizew=210)
(1)证明:
平面
;
(2)若直线
与平面
所成角的大小为
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235d1553f6806c1eee3b17b94d23f0f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11657095fdc31440a1368f10ea4cc2b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26b913e6fa827dcb59f0688170ca730a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eae7aa174fc508217c7a0fcb3db28b1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/d12c361d-2eae-4ba7-8d9a-e752164b7865.png?resizew=210)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2697046fb5056181292bcea4f7f3f8e4.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6e2867f32d3f1c3cd36cd3a11a8580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037fb348109dc2063a268b10eb925a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64b52e43a3c259ab111e0669cf569c7e.png)
您最近一年使用:0次