如图所示,在平行六面体
中,E、F分别在
和
上,且
,
.
![](https://img.xkw.com/dksih/QBM/2022/9/26/3074849500233728/3075541171716096/STEM/a7115b76f21a4de68ed810c2f901420f.png?resizew=206)
(1)证明
四点共面;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1859959fdb4c5edd8056893f94a10a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e3334853138fb74687d66b1e45f2fd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90c0b233487d441fe21ec26266eb0c6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1608899e256364c9c9c3cb47ac420d12.png)
![](https://img.xkw.com/dksih/QBM/2022/9/26/3074849500233728/3075541171716096/STEM/a7115b76f21a4de68ed810c2f901420f.png?resizew=206)
(1)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/821f1b9f4bb03e0d9e5db8e0b4683070.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6c7bcd0581b645e345febce51cf5f53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1433c8103033c67232f2f9ae189608d.png)
22-23高二上·山东济宁·阶段练习 查看更多[6]
山东省济宁市汶上县第一中学2022-2023学年高二上学期第一次模块检测数学试题山东省东营市广饶县第一中学2022-2023学年高二上学期10月月考数学试题福建省平山中学、内坑中学、磁灶中学、永春二中、永和中学2023-2024学年高二上学期期中联考数学试题(已下线)模块一 专题1 空间向量的基本运算 期末终极研习室(2023-2024学年第一学期)高二人教A版(已下线)模块一 专题1 空间向量的基本运算 期末终极研习室(2023-2024学年第一学期)高二人教A版(已下线)6.1 空间向量及其运算(4)
更新时间:2022-09-27 16:27:26
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解答题-问答题
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适中
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【推荐1】已知正三棱锥
的侧棱长为
,过其底面中心
作动平面
交线段
于点
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc2aaed1e9ead175f30f7130569d0411.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feb630ea75318626934df0b44e40e7ec.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0481995d1e5b24bf38ff12f827ea2406.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/29/4cde3e3d-db66-47de-802e-59b254fb7512.png?resizew=273)
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解题方法
【推荐2】我们学习了平面向量的基本定理:如果
、
是平面上两个不平行的向量,那么该平面上的任意向量
,都可唯一地表示成
、
的线性组合,即存在唯一的一对实数
、
,使得
.
(1)类比平面向量基本定理,写出空间向量基本定理;
(2)已知空间向量
都是单位向量,且
与
的夹角为
,若
为空间任意一点,且
,满足
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0411792b587ddd3e04440392f011c224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b95d660852c5226ff65a21cfb36b8b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0411792b587ddd3e04440392f011c224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b95d660852c5226ff65a21cfb36b8b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b4013475c51f8992d3292ca0748c1ac.png)
(1)类比平面向量基本定理,写出空间向量基本定理;
(2)已知空间向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4934fe0958d339078bc1844f5b6a58b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f5c83f2b18efc1d313cfa93793fe7b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef8337706c550bc095d7a2bd872221a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6dfcefb063de42c54340b4378dfee89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b08927eb957325eead728098d7c61587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9778e737a2c6413001c411adb1ca891a.png)
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【推荐1】如图,在四面体
中,M,N,P,Q分别为BC,AC,OA,OB的中点,若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4278c0911e7df78965e78cff69cac5f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b6e7b3d0946d17b418482aaf38c87fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65bfd4f129cd9dc77fcbbd64274b6ae3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/ad62389e-6349-421a-8f75-66033c3ec7c0.png?resizew=211)
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】如图,在空间四边形
中,
,点
为
的中点,设
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/19/4bc62f20-8e45-47e0-9e5c-5444bcc67a1d.png?resizew=162)
(1)试用向量
,
,
表示向量
;
(2)若
,
,求直线
与
夹角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b4dc95aa3f1f159dbf4c61239a8df7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/352afb2166bc2d282d55bd7bba4388e7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/19/4bc62f20-8e45-47e0-9e5c-5444bcc67a1d.png?resizew=162)
(1)试用向量
![](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/21909dd065ccc349a2cbfd4c3cf4976b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbab39da847da8a559994b6c6004aa60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86872300e14331a44252686da1064170.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
您最近一年使用:0次