已知空间三点
.
(1)求以
为邻边的平行四边形的面积;
(2)设
,若
四点共面,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab665d7ad1ae2d9e4245142b9ef10e6a.png)
(1)求以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5dc62e10004e73908091338362917da.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adaf9785ef588229b9f18ed1d5ede78d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c82a10b4f0c9323d726804c89dd9548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
23-24高二上·安徽合肥·阶段练习 查看更多[2]
更新时间:2023-09-28 13:36:53
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相似题推荐
解答题-问答题
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【推荐1】已知向量
.
(1)求
;
(2)若向量
与向量
共面,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8feb8d57eb5b58f06419b8a71c67894.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/596a3ee5d8473fc6619ea7730e13325b.png)
(2)若向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a0b19e69be46452425916a0fcb49c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e8b95a61af300412fc65f846089028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
您最近一年使用:0次
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解题方法
【推荐2】如图所示,在四棱锥
中,
平面
,
,
,
,
.过点
作四棱锥
的截面
,分别交
,
,
于点
,
,
,且
,
.
为
的中点,求实数
的值;
(2)若
,求平面
与平面
所成角的正弦值.
![](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/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52a923784f083b7f4777891afe06b44e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c952710701568f5b87630c1f914cc00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c62040d758136eeb9af6052b72d9b7.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/df64046e91b047037f19e4032e3b6de3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441809d6ce2df21a85b390cdce9b1112.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f72d8a3dc6cb93171ee20567b5440775.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐1】如图,在三棱柱
中,
平面
,
,
,
,
分别为
,
,
,
的中点,
,
.
,
的坐标;
(2)求
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a8bfe2553e852df73185d017c0a62fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1efa2b0018617bd579875185dafca39a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c9d5815dc775d5a5810fff0b016a8d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e6567f04a1bfbf57c21ac8bc4893375.png)
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解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐2】如图,已知向量
,可构成空间向量的一个基底,若
,
,
.在向量已有的运算法则的基础上,新定义一种运算
,显然
的结果仍为一向量,记作![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4478fcaef66e8a6a96925ce12d0f8e8f.png)
为平面OAB的法向量;
(2)若
,
,求以OA,OB为边的平行四边形OADB的面积,并比较四边形OADB的面积与
的大小;
(3)将四边形OADB按向量
平移,得到一个平行六面体
,试判断平行六面体的体积V与
的大小.(注:第(2)小题的结论可以直接应用)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/352afb2166bc2d282d55bd7bba4388e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28fbb9c62062d721157cd66b18591d5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b794ab16a6c54b012b27e732dda59cb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58e02c28a89ab460e500a9476bff21c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddc3fc645ea7d854a040f52f10929a77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aba64ae92194bc4f0f6e49725471542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4478fcaef66e8a6a96925ce12d0f8e8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4478fcaef66e8a6a96925ce12d0f8e8f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aaa9afa26fc6ae4767fdeb9cd2a55e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bb361790078824eb07dc3072fe694eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09cca9e1a1ff53b80a747f6bb476666a.png)
(3)将四边形OADB按向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e07dcf0b16163e0e0e0c0f248466ee7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c89ef3197505169e99f933fab8ff7b83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4d343fc6d33ac4df7ed676161bf9fb2.png)
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解答题-问答题
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解题方法
【推荐1】如图,在四棱锥
中,底面ABCD为正方形,侧棱
底面ABCD,E、F、G分别为AB、SC、SD的中点.若
,
.
![](https://img.xkw.com/dksih/QBM/2022/4/19/2961619415678976/2962713200680960/STEM/b332a190-17b6-4db7-9f0e-4b44828c1dd3.png?resizew=167)
(1)求
;
(2)求
;
(3)判断四边形AEFG的形状.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb2e071d4e01107dcf7d95cbb86b415.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d42e97eee705d164e6ac6de9ecd6d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/534959513ebb93be72baf2661c32699b.png)
![](https://img.xkw.com/dksih/QBM/2022/4/19/2961619415678976/2962713200680960/STEM/b332a190-17b6-4db7-9f0e-4b44828c1dd3.png?resizew=167)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e88b43edf10fc6ac72ad194082a03e7c.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fae1833d875aca777e5f9d6a20d3edc.png)
(3)判断四边形AEFG的形状.
您最近一年使用:0次
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适中
(0.65)
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【推荐2】已知向量
,
.
(1)求
与
的夹角余弦值;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e14e6ce38d3aa1cf65e5ae2ec9eb157e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bdb14fe1462dfa80043e109884e3d29.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3143307ad0ba4a631eac04e814993655.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d0026883a39a2f0ac28b0f42a78f9ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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