如图,四边形
是等腰梯形,
,
,
,在梯形
中,
,且
,
平面
.
(1)求证:平面
平面
;
(2)若二面角
的大小为
,求几何体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58ea8ab3d191cebcb69e087f7b3263ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4b93d7abcfc4c3df48f03aa969c17f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68dfd32a77c3615069ad1e7eb5b226a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3471bde9ec2c95cc301b4b3f468ca4aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f09ad78d4eccd1a9c9ccd3c4af79c79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e02b6df2041ef74bd8a80c9f1ab7cf47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1077520a4816bbb5a37fc45359e34c5c.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5680c88274fe3de009b76721b1128e0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20b69099d2b74ffbb1f365e1468bd8fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/17/dd31f439-617e-4b56-8166-1a1c8d2b2d5c.png?resizew=133)
更新时间:2018-02-09 20:27:49
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】在如图所示的多面体
中,
平面
,
平面
,且
.
(1)请在线段
上找到点
的位置,使得恰有直线
平面
,并证明;
(2)在(1)的条件下,求多面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/407e8e713fa60d872361da1ed2b16793.png)
(1)请在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa3c61d6c19e187b4b824b6f5610cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
(2)在(1)的条件下,求多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a95cbe997d71b933f1b4ae7e2ed0c553.png)
![](https://img.xkw.com/dksih/QBM/2018/6/3/1959551625297920/1960962318278656/STEM/00a934aecb80470ca30467fb29232426.png?resizew=149)
您最近一年使用:0次
【推荐2】如图,
为圆
的直径,点
在圆
上,
,矩形
所在的平面和圆
所在的平面互相垂直,且
.
![](https://img.xkw.com/dksih/QBM/2018/2/1/1873083357437952/1874236421824512/STEM/a8ac04da-b2fe-4a86-a18e-aec1c7c9c2fa.png?resizew=285)
(1)求证:平面
平面
;
(2)求几何体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c91baecb97fadd4f8ab49e6effcbc04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec57c3afb55f97caf50013377b360db.png)
![](https://img.xkw.com/dksih/QBM/2018/2/1/1873083357437952/1874236421824512/STEM/a8ac04da-b2fe-4a86-a18e-aec1c7c9c2fa.png?resizew=285)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1af463c1192cc6472c70ca84d9bdeb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/603c7e98deecdba0cf3773757a9b8304.png)
(2)求几何体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d78d008923973b0529d4f7c9f1a2717.png)
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图,四棱锥S﹣ABCD中,AB∥CD,BC⊥CD,侧面SAB为等边三角形,AB=BC=2,CD=SD=1.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/a2c710d8-496e-4968-baa8-3d026cd5da34.png?resizew=166)
(1)证明:SD⊥平面SAB;
(2)求AB与平面SBC所成的角的大小.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/a2c710d8-496e-4968-baa8-3d026cd5da34.png?resizew=166)
(1)证明:SD⊥平面SAB;
(2)求AB与平面SBC所成的角的大小.
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2】如图,四棱锥
的底面是直角梯形,
,
,
平面
,
是
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/8/c2f60b2e-63c0-4fa7-b898-2d4078751702.png?resizew=169)
(1)证明:
平面
;
(2)求二面角
的大小;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c709ccf950ed4d37ad9e9234dd2446b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb2e071d4e01107dcf7d95cbb86b415.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6e2867f32d3f1c3cd36cd3a11a8580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/696f6b2d30bf86cdb323a1da93ca6d23.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/8/c2f60b2e-63c0-4fa7-b898-2d4078751702.png?resizew=169)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0492b25f10ae45c39f8e9838519259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9c9cfa597b444b5c9dbae7a825a695.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0455492c3db408f8d1d19c57d122a9ac.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
中,
,
,
,
、
分别为
、
上的点,且
,
,将
沿
折起到
的位置,使
,如图2.
(1)求证:
平面
;
(2)若
是
的中点,求
与
平面所成角的大小;
(3)线段
上是否存在点
,使平面
与平面
垂直?说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a69550d878381f6e8fb436e88638f070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e210c9698063925ad2df6b6c1749571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377b5f7197e5bd1afeea4d931307956a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa2a83fed9bf4cb09d84a980452e346.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2fef4031c10abc18c8747af6b9a8a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/17/24ace587-a472-4374-83f8-eb8b6b4fa68f.png?resizew=236)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d26d8a9d64ad3c8cba28840b41ed7837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/923189afc198d153c79059a827f63c87.png)
(3)线段
![](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/be6e96872af0f0b341835576c407e364.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/923189afc198d153c79059a827f63c87.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1】在四棱锥
中,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/c6823f7d-7126-4ab8-8897-5b5d607e2de9.png?resizew=175)
(1)证明:平面
平面
;
(2)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9104a1941e557a85fd1496bc2b9be297.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2309d959c0afb8397ac08a7866389fdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e04ffbf71d026919427aec66d070616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/903c0bc1bdf93783f33a7c24e91030ce.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/c6823f7d-7126-4ab8-8897-5b5d607e2de9.png?resizew=175)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342d452a7b850cd3a15b23619ad39bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.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,在三棱台ABC﹣DEF中,侧面ABED与ACFD均为梯形,AB∥DE,AC∥DF,AB⊥BE,且平面ABED⊥平面ABC,AC⊥DE.已知AB=BE=AC=1,DE=DF=2.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/12/f98cac3a-fe74-4eab-a3b9-b7dee11d6a13.png?resizew=141)
(1)证明:平面ABED⊥平面ACFD;
(2)求平面BEFC与平面FCAD的夹角的大小.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/12/f98cac3a-fe74-4eab-a3b9-b7dee11d6a13.png?resizew=141)
(1)证明:平面ABED⊥平面ACFD;
(2)求平面BEFC与平面FCAD的夹角的大小.
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】在直三棱柱
中,
,
,N,M分别是BC,
的中点,点P在线段
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/933b58f9-ab1d-47aa-906e-a0394b8f3ffa.png?resizew=152)
(1)若P为
的中点,证明:
平面
;
(2)是否存在点P,使得平面PMN与平面ABC所成的二面角为45°?若存在,试确定点P的位置;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09bdbf17f7bb0e70a339b4a1971d5c0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/933b58f9-ab1d-47aa-906e-a0394b8f3ffa.png?resizew=152)
(1)若P为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdcbfb4d473b0a5a5b07fcdcb9ee3644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
(2)是否存在点P,使得平面PMN与平面ABC所成的二面角为45°?若存在,试确定点P的位置;若不存在,请说明理由.
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解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐2】如图,四棱锥
中,底面ABCD为矩形,侧面PAD为正三角形,且平面
平面ABCD,E为PD中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/0b4ae36f-cd9e-41dd-a2d2-c3b0cceb04ff.png?resizew=175)
(1)求证:平面
平面PCD;
(2)若二面角
的平面角大小
满足
,求线段AB的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/0b4ae36f-cd9e-41dd-a2d2-c3b0cceb04ff.png?resizew=175)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4a46fbde58e12b1edc038ae9e921722.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a65bf87f74420270138ed73a2d38ca48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4009bdd7f95dbfc97141b7c8b836dfa0.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐3】如图,△ABC的外接圆O的直径|AB|=2,CE垂直于圆O所在的平面,BD∥CE,|CE|=2.|BC|=|BD|=1,M为DE上的点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/a3094910-0653-4f0a-a3af-f9ef64c2ec83.png?resizew=194)
(1)证明:BM⊥AC;
(2)当DM为何值时,二面角C-AM-D的余弦值为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/a3094910-0653-4f0a-a3af-f9ef64c2ec83.png?resizew=194)
(1)证明:BM⊥AC;
(2)当DM为何值时,二面角C-AM-D的余弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f7e13810d358b913ab4e5e7958d2b3e.png)
您最近一年使用:0次