名校
解题方法
1 . 已知向量
的夹角为
,
,若
,则实数x的值为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27bd29ca7ef74e563f80be8d55c6e35e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f58770a43ff657a684b8da03fd686.png)
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2021-03-24更新
|
308次组卷
|
7卷引用:上海市徐汇中学2018-2019学年高二上学期期中数学试题
名校
解题方法
2 . 直角坐标系上,有2019个非零向量
,
,…,
,且
,各向量的横坐标和纵坐标均为非负实数,若
(
是常数),则
的最小值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a223991a4ec2ca30469960f093ddb1c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc72f5677dda2b1de520c4cc3c1ceb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dacd4d404ed55b2472aad70524ee896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d2d9c226f7e73f332a3765ff5f67a4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aca937524cc40c8f68a37986321b1ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b187ee39dd0a58f1a81ace1f47f2812.png)
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3 . 已知
为非零向量,
,且
,则
的单位向量![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc1e0a1aae86d894c279978ae65368e3.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c9e09ec7ab022f03b52aa73abc5998c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb58883caf5c8ca1e94389839d294b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc1e0a1aae86d894c279978ae65368e3.png)
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4 . 已知
,且
,
与
的夹角
,则实数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
____________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e02c4a5ad4b595f21dc338a2b8e85d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1e4b8a97dc6396b38f5ab30246a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab17fd4247cdd710c363d5d3fbc5bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
您最近一年使用:0次
2019-11-13更新
|
477次组卷
|
3卷引用:上海市上海中学2016-2017学年高二上学期期中数学试题
名校
5 . 老师告诉学生小明说,“若O为
所在平面上的任意一点,且有等式
,则P点的轨迹必过
的垂心”,小明进一步思考何时P点的轨迹会通过
的外心,得到的条件等式应为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5674240a2e062c330b12cd59fb3edc6d.png)
________ .(用O,A,B,C四个点所构成的向量和角A,B,C的三角函数以及
表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a862854c28310a9d1bb6eeddf4f5991.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5674240a2e062c330b12cd59fb3edc6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
名校
6 . 如图,在三角形ABC中,
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69ad13b272a0851a8491f10f83bdbe85.png)
____
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8443843b3240ad88708d7343fcd9ec6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6daafa01b0b7d83df671bf5ad2b00d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/801d64c8f17f46d156a202e992e96238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69ad13b272a0851a8491f10f83bdbe85.png)
![](https://img.xkw.com/dksih/QBM/2020/1/14/2377140870258688/2377388580282368/STEM/e1d30c2157ef4c79a585327feb2e6ec1.png?resizew=193)
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12-13高一下·山西·期中
名校
7 . 若向量
不共线,
,且
,则向量
与
的夹角为________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64fa2fcefaf3d8868da0cb52877c5247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca6b1f56b0d76b5e1d0aa5aeb387c715.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3618e076d32eab239f324e8b07d76bf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8c308ea87b699ee1dcb879a568899de.png)
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2019-10-09更新
|
135次组卷
|
4卷引用:2017届上海市上海中学高考数学模拟试卷(8)数学试题
2017届上海市上海中学高考数学模拟试卷(8)数学试题(已下线)2012-2013学年山西省康杰中学高一下学期期中考试数学试卷人教A版 必杀技 第三章 三角恒等变换 模块综合测试一北师大版(2019) 选修第一册 突围者 第三章 第二节 空间向量与向量运算