1 . 矩形
中,
为
的中点,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20da9a5b0073e4a61d6c53c661bf8ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f268b01cb4eb37f350012af63e572e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-01-28更新
|
283次组卷
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2卷引用:2020届河北省张家口市高三上学期期末教学质量监测数学(文)试题
名校
2 . 已知向量
,
的夹角为
,且
,则
=______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23bd18136e4e71e1e267bc9f8634b932.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec82bd4e0fb7887e5999b8220f60b073.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/260200d547998bcac50a4a491382e7f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac0543524142acdee5b3f869c40040d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6140f2d5dea007302ea20e8b84898e4.png)
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2019-10-25更新
|
612次组卷
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2卷引用:河北省张家口市崇礼县第一中学2019-2020学年高一下学期期中数学试题
3 . 已知向量
与
的夹角为
,且
,
.
(1)计算:
;
(2)若
,求
的值.
![](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/231b861d6d1f1d0b9f52b041cb40eb62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf0b40ab957abd03f1db03ddf71242fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/459b84065e210c3ba8181a0c23255b79.png)
(1)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b4442b5d27518f76cb9b487650035c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d9c5e5972ea47681866dc17b1c101be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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2019-12-06更新
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426次组卷
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2卷引用:河北省张家口市第一中学(衔接班)2019-2020学年高二下学期期中数学试题
4 . 已知
,
是夹角为
的两个单位向量,
,
,若
,则实数
的值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8315ec34019d719771152be2252106e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf39ca3294f5520518dd4f1c0609876.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8936c8c7a58e0752c31b14956c3538.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33efdc4201d7385469cef4c7be484e92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d26a531af61ad37ca9cdeaf1eedfda78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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2019-07-11更新
|
484次组卷
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2卷引用:河北省张家口市2019-2020学年高三上学期10月月考数学(文)试题