如图:已知四棱柱
的底面ABCD是菱形,
=
,且
.
表示
,并求
;
(2)求证:
;
(3)试判断直线
与平面
是否垂直,若垂直,给出证明;若不垂直,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d2b11373ab38e88e0389c575595adec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cf78256450d35903dcb0d71008e76f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7425e954dff22e28ee64901f05b3fc7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adb96420ac535f564aee04a049c1329f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/954b037f02fd77a8b5549df819dbabac.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bda52b48b75bf5409781554205c15d1.png)
(3)试判断直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73845d4d663b3de0b281611fe2c762fe.png)
15-16高二下·江苏泰州·期中 查看更多[3]
2015-2016学年江苏省泰兴中学高二下学期期中数学(理)试卷(已下线)第七章 应用空间向量解立体几何问题拓展 专题一 空间向量基底法 微点1 空间向量基底法(一)【基础版】(已下线)模块三 专题2 解答题分类练 专题3 空间向量线性运算(苏教版)
更新时间:2016-12-04 22:34:36
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相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】已知在多面体
中,
,
,
,
,
且平面
平面
.
(1)设点F为线段BC的中点,试证明
平面
;
(2)若直线BE与平面ABC所成的角为
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/066cd386723885c535ea720f5817847a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0028211551dd418eaaf51dde450f8b73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5545dc3211671941048034af38092fa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/236c134aad7d9a21c49c07e924b9a531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8ff58f671a287701011a1b31e67e28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/21/eee2123a-b085-465b-a604-374e6bef3b4f.png?resizew=168)
(1)设点F为线段BC的中点,试证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5f445af1ae136773cb338920552ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)若直线BE与平面ABC所成的角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd29cc627d76412c236aac6b29fa0fdf.png)
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【推荐2】已知如图1直角梯形
,
,
,
,
,E为AB的中点,沿CE将梯形
折起(如图2),使平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/28/4f4306f1-997f-4f77-a5a8-ac8190128fa7.png?resizew=258)
(1)证明:
平面
;
(2)设线段CD的中点为F,求平面
与平面
所成的锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b377f22aafd3742ad860f77abaacef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e0b7d845cbceccd3e76ca461fcc534.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8f5ba965420dfd5aa4da211682df096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6bfad3f7e65188bcf7f62ea5acdbf4a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/28/4f4306f1-997f-4f77-a5a8-ac8190128fa7.png?resizew=258)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6bfad3f7e65188bcf7f62ea5acdbf4a.png)
(2)设线段CD的中点为F,求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/437bc0b5b7815c77b4956f194fc6ef52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8257b6bd25104e07b9ad935c0a3aac4.png)
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解题方法
【推荐3】如图所示的几何体中,四边形
是菱形,
是矩形,平面
平面
,点
为
的中点,点
为
的中点.
(1)求证:
;
(2)求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3ab4fdfc612c9fa2dd8ae24904192d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eb81bae9b6dec98c92d9573c071d905.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d617aaa770c4e05893a1e4458f43d3bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39b99f7b60714bd1a18cc6e4cb3fbf96.png)
![](https://img.xkw.com/dksih/QBM/2018/6/8/1963031308115968/1967988343578624/STEM/8635a8685d4e44b18d2a9aa887368373.png?resizew=199)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20c656995564909328b5e0a668d3a075.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12d8677ae5ca7acf874d93789425d172.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/831097ce31934e2f7b21c4927b7618f2.png)
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解题方法
【推荐1】如图,已知四棱锥
中,四边形
是边长为4的菱形,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/12/8deb3af9-ebeb-46d5-8163-35d3723d41e3.png?resizew=206)
(1)若四棱锥
是正四棱锥,求四棱锥
的体积
;
(2)若
平面
,求
的长.
![](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/491c3a4f72b84ebadd28b90711435adc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/12/8deb3af9-ebeb-46d5-8163-35d3723d41e3.png?resizew=206)
(1)若四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f95475bfc06e884754eb4a455c3f434e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a66a0cd026792c9283f0cc2acead291.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
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【推荐2】平行六面体
中,底面
是边长为1的正方形,侧棱
,且
,
为
中点,
为
中点,设
,
,
;
,
,
表示向量
;
(2)求线段
的长度.
![](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/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e322f79e083e471b34950b9ffabffdc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3adc4ed291596abf3bb93ae7a075d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e984585ddf28c039219afcebf229de7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8780f5b68f8907a57c1c2f96233a78c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a0b19e69be46452425916a0fcb49c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3722488cf68b05c22d3e6c0b4de6991.png)
(2)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
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解题方法
【推荐1】如图,在直三棱锥
中,
,
,
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/16/a1beaf9a-201d-4c7f-8e44-42f36fd1fba4.png?resizew=176)
(1)求平面
与平面
夹角的余弦值;
(2)若
是
的中点,
,则在线段
上是否存在点
,使得
平面
?若存在,求出
的长;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/7c3e9ef3e849788645552cfb0735d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d927585a17c2e98ef7d5a9589a26ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/16/a1beaf9a-201d-4c7f-8e44-42f36fd1fba4.png?resizew=176)
(1)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de9078475c350c04bd97666d808dd55a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cc5d5153f3b79cc6372bd74be1d2270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a604466a9c8d10d557b3dfc43b547065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b1a378a3a4660eb1ece52085a9b44d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de9078475c350c04bd97666d808dd55a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e935bb9d7b7115429edbd1e7469af65.png)
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【推荐2】如图,在平行六面体
中,
,
,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/14a6d829-ae71-404c-a158-80c061c7dc84.jpg?resizew=193)
(1)求证:
平面
;
(2)求
与平面
所成角的余弦值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a54a0790cdac625332f3c1aa1f56d74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3124ff74f4be45f60af733deb56ba49.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/14a6d829-ae71-404c-a158-80c061c7dc84.jpg?resizew=193)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db4e1e8fda90563d2dec09d15e676bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfc21c182d284d0a028210baa4dea49.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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