如图,在三棱锥
中,侧面
是等边三角形,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/84bb54ad-2d69-4e8d-9f60-eccf4d3739b2.png?resizew=167)
(1)证明:平面
平面
;
(2)若
,则在棱
上是否存在动点
,使得平面
与平面
所成二面角的大小为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e4d19bf237a6fca67e0d01a9ddb726.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/84bb54ad-2d69-4e8d-9f60-eccf4d3739b2.png?resizew=167)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8520a21b909d04f763d0f61dd74bc158.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf2f0df53aa68c9c334165034788166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
更新时间:2022-11-30 05:55:54
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,在棱长为
的正方体
中,点
是
中点.
![](https://img.xkw.com/dksih/QBM/2020/9/12/2548387278536704/2550966375800832/STEM/221ee527ae3349be8a41989f4dac1656.png?resizew=245)
(1)求证:平面
平面
;
(2)求二面角
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2020/9/12/2548387278536704/2550966375800832/STEM/221ee527ae3349be8a41989f4dac1656.png?resizew=245)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9578aee1ffa7a74c04debf1679b068d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77d6935297fc11127a0927a046a2e76a.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd190b5a26dfb45a06c1d6ee86dd82d9.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,在三棱柱
中,平面
平面
,四边形
为菱形,点
是棱
上不同于
,
的点,平面
与棱
交于点
,
,
,
.
(Ⅰ)求证:
∥平面
;
(Ⅱ)求证:
平面
;
(Ⅲ)若二面角
为
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eff0db05826cbff651faf0144904b32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ac553945e7183df1f45964fedf88f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2f39d3fcb1664705228e683c2cc3b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57eb483244073b76d7acd49feaf18280.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd94d3c3765c52e2d6375f1959686430.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0f861273767ae7aeb7251dbcfe4554c.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e89195bacd53d43195e70c12b5cfa041.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea848cd2aa3a464618020475097949fc.png)
(Ⅲ)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/512c8feb90b36a8035556fec4d0b86f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/996bf3d35b6763cbc1a423b13a9df2dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://img.xkw.com/dksih/QBM/2017/11/14/1817064720875520/1818519677435904/STEM/5c4c541a-2fa5-41b9-904d-c8ae0038f93b.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐3】如图1,在平面五边形
中,
,且
,
,
,
,将
沿
折起,使点
到
的位置,且
,得到如图2所示的四棱锥
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/d1bc4475-2f11-4012-9e6e-9f03ae043e14.png?resizew=280)
(1)求证:
平面
;
(2)求平面
与平面
所成锐二面角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3aafd2e9983c478261f5d6cd8d5c027.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377b5f7197e5bd1afeea4d931307956a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37f210d9a0dddb66fe41fa057b6820b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/025fa58b905703c01afa35a31ae22447.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b1cf3846460c33132cf74fe93f9371d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8d89a7eaa8e282efd9406ee958e061c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1fd0b59a8d94c6e0b7a89c43f048247.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/d1bc4475-2f11-4012-9e6e-9f03ae043e14.png?resizew=280)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db807b09cc550f476b3f8fa0c6a14425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e6c2dad46a9052a4185a4f7b4ae8a2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.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1】如图,在四棱锥
中,底面ABCD是矩形,
底面ABCD,
,点M是SD的中点,
且交SC于点N.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/19/3147f456-770f-4b29-abec-900ede199f31.png?resizew=166)
(1)求证:
∥平面ACM;
(2)求证:平面
平面AMN.
![](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/bc3ffec2558e590c0712e77d7ab27ec5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f04e6ed01c8f3778a64f055d33ee70c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/19/3147f456-770f-4b29-abec-900ede199f31.png?resizew=166)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4db9b82b67efe45a02fca32bfcf5dc.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78307cd417504554a4e2276fe24d1162.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,在底面为菱形的四棱锥
中,
,
.
(1)求证:平面
平面ABCD;
(2)已知
,求直线BN与平面ACN所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4117625867a74cd022584500c76deca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54572f037a78cc7dfec1afe08b3af70e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d99bc88196c306a7ec65806c9372beb4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/30/ffe6ced8-1cce-4542-91a2-c79234250806.png?resizew=175)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e05d8681a679bd31922e62480f69d55.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4ca755049ca4971de25cc32c535275d.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图1 ,在
中,
,D为
边上一点,以边
为对角线作平行四边形
,沿
将
折起,使得平面
平面
,如图2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/eaa42f59-7cdc-4b5f-8ff5-936249c59869.png?resizew=317)
(1)在图 2中,设M为
的中点,求证:
;
(2)在图2中,当
最小时,求二面角
的平面角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb407648c7d08e15e37987e3f913697.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc1cbcd6d00f0c36bad8254297d9f33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8dc6db50a9709c3f4d84eee7bdf1250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/eaa42f59-7cdc-4b5f-8ff5-936249c59869.png?resizew=317)
(1)在图 2中,设M为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8979376cb9469da3f642de1f110559d0.png)
(2)在图2中,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff1cdec4f1634081373699149a03554b.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,平行四边形ABCD中,
,线段
的垂直平分线为AE,垂足为
,将
沿AE翻折到
,此时点
在平面
上的射影恰为点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/2d443b60-28c5-4eef-8b44-39bb0071b4e1.png?resizew=310)
(1)若
,求证:平面
平面
;
(2)若直线
与平面
所成的角小于
,求AE的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63b43490ca09467a4c8cd8cfe91c94e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0374b8c5e00f831181538ba2f3675c1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/2d443b60-28c5-4eef-8b44-39bb0071b4e1.png?resizew=310)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b348d598a0fc163951e1145909910d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da23c83e765a1bd5705800a7d80619ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bb31d531a1988bcf23e2d81a80f9048.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9db7e46fef4f27799aec83a8bfb8eae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3598b267a362446bdec58695f55575fd.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】在四棱棱
中,底面ABCD是矩形,
平面ABCD,
.M为线段PD上一点(M不与D重合),且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/27/8d620d3c-c43b-4d8b-adbb-93deeb2964e3.png?resizew=173)
(1)证明:M为PD的中点;
(2)若平面BAM与平面CAM夹角的余弦值为
,求AB.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff647427005a431ec4aa80e530e84da7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90a52818f1e8b7c27f207abae182a64d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/27/8d620d3c-c43b-4d8b-adbb-93deeb2964e3.png?resizew=173)
(1)证明:M为PD的中点;
(2)若平面BAM与平面CAM夹角的余弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.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
中,底面
是直角梯形,
,
,
,侧面
底面
,且
,
为棱
上一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/4189e172-ad25-46dd-81b7-c4edeeac3f7c.png?resizew=161)
(1)求证:
平面
;
(2)若二面角
的余弦值为
,求四棱锥
的体积.
![](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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b94651d11df3a469d7ac72e6ac74c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3ed4f6bc8c7f08e80b194b867b0092d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974d34de3a12418d6b700420afd1b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ff16c7e314b275081197164472f8f3f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/4189e172-ad25-46dd-81b7-c4edeeac3f7c.png?resizew=161)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30067b7b236d17af8a462f96a58d11bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca48c18021e7be4bbb3e95576e1c1b5f.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbeab80976db9b4689b9446cda06196a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55176f6357df50f85d36b732e31972d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
您最近一年使用:0次