如图,在底面为菱形的四棱锥
中,
平面
,
为
的中点,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/f2651297-27ef-4798-b239-c538673aeea7.png?resizew=160)
(1)求证:
平面
;
(2)若三棱锥
的体积为1,求点
到平面
的距离.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.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/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b96fac11d72f72c805dbddb8da72d68.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/f2651297-27ef-4798-b239-c538673aeea7.png?resizew=160)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30067b7b236d17af8a462f96a58d11bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
(2)若三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba759550d6c10ffd2922b936888f3973.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
更新时间:2016-12-06 17:01:22
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,平面⊥平面
,
是边长为1的正方形,
,
,平面
∩平面
,点A与
不重合.
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c51c25b65a37b676ae3c3b71c29f9b.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8511319e215aeba124994a03f2d91fcb.png)
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解题方法
【推荐2】如图所示,在三棱锥
中
,
,三棱锥
是正三棱锥,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/95d08529-2862-4e10-89ad-e431f1cf7285.png?resizew=186)
(1)求证:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b40d0d2f3cdd8981bb792ad87efb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2ba6b70b5abf8672f3fd9ae0a2b8128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b565e518d475a50358fedff2f0bb8dec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fc0b71be097499ea93df25005b2d0ae.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/95d08529-2862-4e10-89ad-e431f1cf7285.png?resizew=186)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc521258fcaeaf7acffc5ae98c3af6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51f73a0ca4e6c794242489066fddb6c5.png)
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【推荐1】如图,三棱柱
中,四边形
均为正方形,
分别是棱
的中点,
为
上一点.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
平面
;
(2)若
,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a92e457c6aa0dd5fe8976dc77cae7f3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da62d9c339d604c5ffafc82fc54e2b17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e516121599c9fcc528121c00afcf52fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a148a5584e41408fc74f8bd386b5b8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26cd89328daccadf245e5181b0f03ec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a148a5584e41408fc74f8bd386b5b8.png)
您最近一年使用:0次
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解题方法
【推荐2】如图,在棱长为2的正方体
中,E为棱BC的中点,F为棱CD的中点.求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cf55043d616833f4a69e0386b03711b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37fd7d2bc169d4467ad7d70861ed6351.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/84f3464c-93e7-4970-a5a5-5b16d5edbacb.png?resizew=164)
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解答题-问答题
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解题方法
【推荐1】如图(1)所示,在
中,
,
,
,DE垂直平分AB.现将三角形ADE沿DE折起,使得二面角
大小为60°,得到如图(2)所示的空间几何体(折叠后点A记作点P).
(1)求点D到面PEC的距离;
(2)点Q为一动点,满足
,当直线BQ与平面PEC所成角最大时,试确定点Q的位置.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7bae5203f4b4acf23779114b3466e17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ffc2817fa590affb5a760a25dc65308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284e282bb1d9fbf8634b3506ee5358ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/370148e9147aa25c60a07ab4ad46e83d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/15/da6bb2f5-fb83-4d9d-8a5d-115fb9e03626.png?resizew=284)
(1)求点D到面PEC的距离;
(2)点Q为一动点,满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b3c0c5ccdfe3e4cd1eb09cb913241d9.png)
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解答题-证明题
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适中
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解题方法
【推荐2】已知平行四边形
中,
,
为
的中点,且△
是等边三角形,沿
把△
折起至
的位置,使得
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/7/c9b065d2-b13d-4b26-b990-128258088629.png?resizew=257)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/7ab73ea2-efec-4917-a379-c651c780764b.png?resizew=241)
(1)
是线段
的中点,求证:
平面
;
(2)求证:
;
(3)求点
到平面
的距离.
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657dffbd3623b705f871878fbd9df57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/502fc5e3c7f636aac9064ec69018c95c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/7/c9b065d2-b13d-4b26-b990-128258088629.png?resizew=257)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/7ab73ea2-efec-4917-a379-c651c780764b.png?resizew=241)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9d32e76582bf550593fdef53e081225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657dffbd3623b705f871878fbd9df57e.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf93370d9638286955c65203ce50ff1.png)
(3)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
您最近一年使用:0次
解答题-问答题
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适中
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解题方法
【推荐1】如图,已知在正方体
中,
是
的中点,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/1bdbac10-ecb6-471b-b5e4-f7e81bd43ec2.png?resizew=164)
(1)问:向量
,
,
是否为共面向量?
(2)求
.
(3)写出平面
的一个法向量.
![](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/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7dfd4c4648dc52d0952c20f3978fadd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/1bdbac10-ecb6-471b-b5e4-f7e81bd43ec2.png?resizew=164)
(1)问:向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d507cbc45fbda1630807543d4e038bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa3d0a957db97f161340aafb4a0d912c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdf814115dc9fea36cc1b6cd2b293390.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45799d87470e2dfa4696451347af6e2f.png)
(3)写出平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
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解答题-证明题
|
适中
(0.65)
解题方法
【推荐2】如图,在三棱锥
中,平面
平面
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/10/6d36eb33-3c67-4c62-bad2-d08c515cf65a.png?resizew=182)
(1)求证:
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baa9cc24815674edd1eac13428cd2923.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2c4b4a47ed1a423def7ccd336e28b2f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/10/6d36eb33-3c67-4c62-bad2-d08c515cf65a.png?resizew=182)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bbd7c2767c106faf27d6a97ebc8e739.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a438393ddfc7da1804baf4932442bb35.png)
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