如图甲,已知在长方形
中,
,
,
为
的中点.将
沿
折起,如图乙,使得平面
平面
.
(1)求证:
平面
;
(2)若点
是线段
上一动点,点
在何位置时,平面
与平面
的夹角为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f9fba8a4098c1a0515286eb8d616dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bb5012f6c70a1e98d682b6d021fadd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0760712e3e2ea02b755b751e760d0c55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/9/1536d09b-82e5-4208-ae25-ae79c0b6a36b.png?resizew=330)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc46688d8723cf2003fc25890265200.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e73f9c7eed1364e2ab855ae80621eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57546e91a756f7147114a150a9ae8977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
更新时间:2023-10-20 22:16:20
|
相似题推荐
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,三棱柱ABC-A1B1C1中,已知AB⊥侧面BB1C1C,AB=BC=1,BB1=2,∠BCC1=60°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/48c343d3-0f41-4451-bc17-0c18434fac36.png?resizew=154)
(1)求证:BC1⊥平面ABC;
(2)E是棱CC1上的一点,若三棱锥E-ABC的体积为
,求线段CE的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/48c343d3-0f41-4451-bc17-0c18434fac36.png?resizew=154)
(1)求证:BC1⊥平面ABC;
(2)E是棱CC1上的一点,若三棱锥E-ABC的体积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5040d31e784398842b04ed7dd0aacc10.png)
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【推荐2】如图,在四棱锥
中,
平面
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/28/23c46988-b8fa-4a4e-89f6-da252d557adb.png?resizew=187)
(1)求证:二面角
为直二面角;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deeb2b65014a00e15896b45a20d97965.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8ef58be8708144272538ee427fb92c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3bbe4cdd2c154bd9a8073b0d4cecb8a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/28/23c46988-b8fa-4a4e-89f6-da252d557adb.png?resizew=187)
(1)求证:二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1069d514c3c32aeabd274475ee209ed6.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,在四棱锥
中,底面
为平行四边形,侧面
底面
.已知
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/fec2f153-215c-4880-ae7f-9f550e6ca629.png?resizew=255)
(1)求直线
与平面
所成角的正弦值;
(2)在线段
上是否存在一点
,使
?若存在,请求出
的长;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b6e6192cf24ada791c26c2d6d434069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42ed2e5bd5a0f033e24008697bf4963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1ac2e11788860424508ea9e80cf89d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/def1e593dec462ece71a9482c52cfa42.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/fec2f153-215c-4880-ae7f-9f550e6ca629.png?resizew=255)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defa5b53043ae802bb1af7d14374406d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9c9cfa597b444b5c9dbae7a825a695.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6c3c6e558093d87cd60f58bf73e834d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,在三棱锥
中,
,
,
平面
,平面
平面
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/17/82d50d27-4692-4979-83dc-30b553aab968.png?resizew=156)
(1)求证:
;
(2)求平面
与平面
的夹角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd893c4964b7f1ef69f0563d74c76d0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b40d0d2f3cdd8981bb792ad87efb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/17/82d50d27-4692-4979-83dc-30b553aab968.png?resizew=156)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf2f0df53aa68c9c334165034788166.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3】如图,矩形ABCD中,
,
,
分别在线段BC和AD
上,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
,将矩形ABEF沿
折起.记折起后的矩形为MNEF,且平面MNEF
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/31c3376c-1035-47da-9202-078caa4b073c.png?resizew=444)
(1)求证:
平面
;
(2)若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73ba94cec6c03980be9ca03774379fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
上,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bb0bd784f9ca4d5a099b5e55c9a0374.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/31c3376c-1035-47da-9202-078caa4b073c.png?resizew=444)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92f0e0d048793657294151529f0148fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13576338960eb920b0d69e91479d07dd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38c5c9cc1ed4bce98b7fae77e70b227f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5bdeff879f62f66b12fbd4cb16e3b4a.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,在正四棱柱ABCD﹣A1B1C1D1中,AB=1,AA1=t,建立如图所示的空间直角坐标系O—xyz.
(1)若t=1,求异面直线AC1与A1B所成角的大小;
(2)若t=5,求直线AC1与平面A1BD所成角的正弦值;
(3)若二面角A1—BD—C的大小为120°,求实数t的值.
(1)若t=1,求异面直线AC1与A1B所成角的大小;
(2)若t=5,求直线AC1与平面A1BD所成角的正弦值;
(3)若二面角A1—BD—C的大小为120°,求实数t的值.
![](https://img.xkw.com/dksih/QBM/2018/6/27/1976377785122816/null/STEM/ef607c5e15d94c9c9c94ab7635e2955d.png?resizew=136)
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,在四棱台
中,底面
是菱形,
,
,
平面
,点
是棱
上一点.
![](https://img.xkw.com/dksih/QBM/2020/11/19/2596357372600320/2597749626191872/STEM/65c758244e714aff9515c513c8823b0b.png?resizew=226)
(1)若
是
中点,求证:平面
平面
;
(2)即二面角
的平面角为
,且
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec7e5c13708f76d82f43f29cfcbd0154.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f1477ad1f6e569f30d5f9aab35378e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2020/11/19/2596357372600320/2597749626191872/STEM/65c758244e714aff9515c513c8823b0b.png?resizew=226)
(1)若
![](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/b0826b52fe114e525c90df7f64f95ccc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c52091eb745de866044477641a7c55f.png)
(2)即二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54ad0edb590fa1cc97383714f87cbda6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5b1b2a00d00a9a722465aec58c9acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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