如图,在直三棱柱
中,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/8/77ad79b6-0906-4c6a-a511-0af51f8c90bc.png?resizew=142)
(1)证明:直线
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ae1b5a1a3f5cb44a771944e1534563b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/8/77ad79b6-0906-4c6a-a511-0af51f8c90bc.png?resizew=142)
(1)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4560fa4ad459b58b723c74bd24e51ebf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7994f25559402687fa7f7d8a3966928.png)
更新时间:2024-02-08 12:35:03
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,直四棱柱
中,
,
,
,
,
为棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/7f1ea9a6-5a42-4d2f-99a5-c71835176632.png?resizew=200)
(1)证明:
平面
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5679a74e9f5506266ab627894ab03243.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da9db73dad37a8a07a7ccc49101db545.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/7f1ea9a6-5a42-4d2f-99a5-c71835176632.png?resizew=200)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a59d296654aa17749f8300ae1d1da0e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aa0997a0d1555ea536791bed2e52edc.png)
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适中
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【推荐2】如图,扇形
的半径为
,圆心角
,点
为
上一点,
平面
且
,点
且
,
面
.
(1)求证:
平面
;
(2)求平面
与平面
所成二面角的正弦值的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ff5c21185c13eae675906dabd3593c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/208795e14dc3e232de8f370942fec2ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30eea764221d33d1e196647111762c05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3643175b4e5ea91235a276a9ba9291c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8c2b786c64e6a9ed2ec5670cde74f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08452588675f76da2f8d31387b3a8224.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/10/ae0f9e45-328b-4ab2-82b0-744e24695549.png?resizew=148)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f6d39135a2f8472d66ea00eda3b13ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a44cd09d9ad46264de4620c60370d49d.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83efd6afec2f73c52e4b027a12d9f817.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08452588675f76da2f8d31387b3a8224.png)
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图,已知正三棱锥
和正三棱锥
有相同的底面,且
.
,求二面角
的余弦值;
(2)若
平面
,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7edc2e23df190c35aafad93410a05b8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f83a04565a8ebaa111894b724b0ba266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd840aa25444b439092983b376940a09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f96627abd793ca157d4dd1587f584d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7bbe2be784dd3794204a5c4cb4f775.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf25e032b5599ac49383de06e776365.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,正方体
的棱长为2,
是棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/4603aa07-53b7-4ed4-97ed-e2918b80f773.png?resizew=169)
(1)求证:
;
(2)求平面
与底面
所成的锐二面角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/4603aa07-53b7-4ed4-97ed-e2918b80f773.png?resizew=169)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8a2d7fc766cfa5d364fd9520f00c20e.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2331bccb6ebf5b9fd639df994f575a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
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(0.65)
名校
【推荐1】如图所示甲,在四边形ABCD中,
,
,
是边长为8的正三角形,把
沿AC折起到
的位置,使得平面
平面ACD,如图所示乙所示,点O,M,N分别为棱AC,PA,AD的中点.
求证:
平面PON;
求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c906d73341336b7c736592733b18269b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98b9497e0db200f5fabc41bb1b37dfe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882589c896c6993d9687f0e14a283481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882589c896c6993d9687f0e14a283481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/680965a7970b9b71e160393b504af31c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc7bf85b14ee3c0505dba32ec1b1070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/561bf16f9f9e8f81f8e5a75edf1f1e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36143a5fb9a9ef62ef639d8077f765b7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/1690e13c-7669-44d2-8dd1-93775c521141.png?resizew=309)
您最近一年使用:0次
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适中
(0.65)
解题方法
【推荐2】已知平面
平面
,
,
,线段
,
,
,
,
.求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa807136194c18d3ac58902c67f9333.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40b707f5ee4fbb2e637c65fbc6d8ed03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c87959310928d7feb43d574d55b868f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fca773f62b64bef9e2a2befe436a5dd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ee0ddf2508e7f07ffbe5635033c931.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c638fb895acd987140d0ca6bef097499.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb0a2d7d40a6c0bf1fddb802db381689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13b608e3d23dce1eb0e7e2e901feed2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/31/7d1879f8-7243-4178-97db-5e8b94ee7f66.png?resizew=189)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐3】如图,菱形
的边长为12,
,
与
交于
点,将菱形
沿对角线
折起,得到三棱锥
,点
是棱
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/87d3ca05-d04c-4d28-ac5c-0e67b33d806b.png?resizew=459)
(1)求证:
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41ffdaecfb3c73d403179e5745c71a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0845725214dc1d9580a027a8206b07fc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/87d3ca05-d04c-4d28-ac5c-0e67b33d806b.png?resizew=459)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305e6ac17da2d05a1a11c3e37da426cd.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c878e4572a232566c80d34dac90ecd6.png)
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适中
(0.65)
名校
解题方法
【推荐1】如图,在直三棱柱
中,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/18/b615c959-d9fb-4ae7-9b80-d4ebd49d0434.png?resizew=146)
(1)证明:平面
平面
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c013bbe1fb6e9acf461548b5cf6cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4339a40ae9d1947ec3a4b3e2fa3a16cd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/18/b615c959-d9fb-4ae7-9b80-d4ebd49d0434.png?resizew=146)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3a59d7bf91a7540e35ce0011ad9b97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90bf62a5229257b6ed65f3a47873dd3.png)
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【推荐2】四棱锥
中,底面
是边长为
的菱形,侧面
底面
,
,
,
是
中点,点
在侧棱
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/35fe0437-b6a4-40ad-a284-bd8c8b798ba8.png?resizew=207)
(1)求证:
;
(2)若
是
中点,求二面角
的余弦值;
(3)是否存在
,使![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
平面
?若存在,求出
的值;若不存在,说明理由.
![](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/61128ab996360a038e6e64d82fcba004.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/00ec435aa1401dbce7863b531bf2f3e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1328e05d150f86dbe18656662eaa8f6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/35fe0437-b6a4-40ad-a284-bd8c8b798ba8.png?resizew=207)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdfa54114f04a75b8c96165b3718ed7f.png)
(2)若
![](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/db3a1e5f3aa16fc4009b66f6d6ac64c5.png)
(3)是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a29292b2a3a66375202bca1fb986ecb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d46d11e82d212c5dd76dfc0bca0399e4.png)
您最近一年使用:0次