如图,已知长方形
中,
,
,
为
的中点,将
沿
折起,使得平面
平面
.
(1)求证:
;
(2)若
是线段
的中点,求平面
与平面
的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a88c44f558705de3bcefcfc0ece96b8f.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/2023/11/21/dd4faa56-f0ea-46df-bd27-a6c01db73538.png?resizew=326)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/804c0e2a375b5f4ff1c420532968efc3.png)
(2)若
![](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/d0d4a244bd6c29b79ddbf0bbdaf6cd14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e8a20c1fc8a5620db5db3a74eb01201.png)
更新时间:2023-11-19 21:57:07
|
相似题推荐
解答题-证明题
|
适中
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名校
【推荐1】如图,已知矩形
中,
,
,将矩形沿对角线
把
折起,使
移到
点,点
在
上,且
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/894891b7-c4cf-4903-8c21-f8ed5f324995.png?resizew=195)
(1)求证:
;
(2)求证:平面
平面
;
(3)求二面角
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e5981445b6f2a6c58974158d96a4de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/894891b7-c4cf-4903-8c21-f8ed5f324995.png?resizew=195)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f752d8a27ed612c37ddc86e8b483a243.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21dee56b9f36ba8f76fe67b76383636b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e18b48c0263fbc4cbf072b7662589e2.png)
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【推荐2】如图,已知四边形ABCD为梯形,AB∥CD,∠DAB=90°,BDD1B1为矩形,平面BDD1B1⊥平面ABCD,又AB=AD=BB1=1,CD=2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/ad9cec3e-69c6-4fca-adaa-37ed612f92ab.png?resizew=212)
(1)证明:CB1⊥AD1;
(2)求B1到平面ACD1的距离.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/ad9cec3e-69c6-4fca-adaa-37ed612f92ab.png?resizew=212)
(1)证明:CB1⊥AD1;
(2)求B1到平面ACD1的距离.
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【推荐1】斜三棱柱
的体积为4,侧面
侧面
,
的面积为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2031d209711b058f3d278ede3c1d33.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/9a15d76f-0386-47ec-895e-9749c2c3ac84.png?resizew=160)
(1)求点
到平面
的距离;
(2)如图,
为
的中点,
,
,求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a2e10a5aebe40a9018d5ee3ade7af8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6941ec0543ccc9140b347ebfe8d45d2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2031d209711b058f3d278ede3c1d33.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/9a15d76f-0386-47ec-895e-9749c2c3ac84.png?resizew=160)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
(2)如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea5a7487a18a0c3df513f58510ac0e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f9ee82d7cddd015d0715152994bb29f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/966b2d5659b3dc130fe0e4b2c0ff0072.png)
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解答题-证明题
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解题方法
【推荐2】如图,P是四边形ABCD所在平面外的一点,四边形ABCD是
的菱形,
,平面PAD垂直于底面ABCD,G为AD边的中点. 求证:
![](https://img.xkw.com/dksih/QBM/2022/5/14/2979268881956864/2979747023134720/STEM/a597e7831c9a468f89b24bb9cad102b2.png?resizew=219)
(1)
平面PAD;
(2)若
,求多面体PABCD的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974d34de3a12418d6b700420afd1b2.png)
![](https://img.xkw.com/dksih/QBM/2022/5/14/2979268881956864/2979747023134720/STEM/a597e7831c9a468f89b24bb9cad102b2.png?resizew=219)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf65b8884909d735d575efe81a2d2ad.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c0cf7a89ea148e0481a56f127297bb2.png)
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【推荐3】如图,在四棱锥
中,底面ABCD为平行四边形,
,
,
,平面
平面ABCD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/4/57d4f9e4-a876-4756-9dd5-3ff2ef0e5f7a.png?resizew=220)
(1)证明:
;
(2)若
,点E为棱AD的中点,求直线PE与平面PAB所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d6baf49925a5bcb359b542d45067c81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/4/57d4f9e4-a876-4756-9dd5-3ff2ef0e5f7a.png?resizew=220)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bafa8c14100a4f847b41b9148954116c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8254b52b379a420c17d38334940b073.png)
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解题方法
【推荐1】如图,三棱锥
的三个顶点
在圆
上,
为圆
的直径,且
,
,
,平面
平面
,点
是
的中点.
(1)证明:平面
平面
;
(2)点
是圆
上的一点,且点
与点
位于直径
的两侧.当
平面
时,画出二面角
的平面角,并求出它的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce7af7c5df749c6fa9bbe87faa72c66d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](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/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65692d5558690a62f5f15d1b797f3201.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/133760237c0ccf2d6a83786925b6d23c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b60870baa5e3fbc33a749aa5f0a94be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/11/fd929f2d-a899-4ca6-8284-173800329672.png?resizew=191)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b051f51b7d4ce0a3a6d0b7eb880a2fbf.png)
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解题方法
【推荐2】如图,
是正方形
的
边的中点,将
与
分别沿
、
折起,使得点
与点
重合,记为点
,得到三棱锥
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/ca23611b-ce62-489c-96b2-d0592faf2fbd.png?resizew=251)
(1)求证:平面
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2657e02314469ad2b13d31dce41b4343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/723932f1d37ae7b8700bcbefee627865.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/ca23611b-ce62-489c-96b2-d0592faf2fbd.png?resizew=251)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a940f43e94a687339a9b50e0694e2e8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed0c936e6186b48c264d430d7c40fe44.png)
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解答题-作图题
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【推荐3】如图所示,在三棱锥A-BCD中,E,F分别是AD,BC的中点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/c1398470-1044-4cf0-829f-c307c30b89f4.png?resizew=182)
(1)在∠BDC的角平分线上,是否存在一点O,使得AO∥平面EFC?若存在,请作出证明;若不存在,请说明理由;
(2)若平面BCD⊥平面ADC,BD⊥DC,
,求二面角F-EC-D的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c776123acaded2ccf842d180b9f7741a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/c1398470-1044-4cf0-829f-c307c30b89f4.png?resizew=182)
(1)在∠BDC的角平分线上,是否存在一点O,使得AO∥平面EFC?若存在,请作出证明;若不存在,请说明理由;
(2)若平面BCD⊥平面ADC,BD⊥DC,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab81304e0e2784256d1c59c60eee8bb7.png)
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