1 . 已知向量
,
,
在
上投影为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c995de52e49461cd79f2aa3181effcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4611f7a99ee986b51adecf1aeae7de8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
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2 . 已知
是边长为2的正六边形
边上一动点,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a9c27ea53c6748e4a788b7400f25a4.png)
A.最大值是![]() ![]() | B.最大值是![]() ![]() |
C.最大值是![]() ![]() | D.最大值是![]() ![]() |
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解题方法
3 . 将平面向量
称为二维向量,由此可推广至
维向量
.对于
维向量
,
,其运算与平面向量类似,如数量积
(
为向量
,
的夹角),其向量
的模
,则下列说法正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcb24fba3671ee649c3f863b74f34970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3e997f636a3d37262a1733b4ec2bdd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427fa45527d0ce469bfd060bf6f991f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ad3fd2ca82c84da2897fdbf56cf6486.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427fa45527d0ce469bfd060bf6f991f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea89b123e9cd699372ab3a8dc64db4cc.png)
A.不等式![]() |
B.不等式![]() |
C.不等式![]() |
D.若![]() ![]() |
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2021-05-28更新
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4卷引用:湖南省长沙市长郡中学2021届高三下学期考前冲刺卷数学试题
湖南省长沙市长郡中学2021届高三下学期考前冲刺卷数学试题江苏省盐城市2021届高三下学期5月第三次模拟考试数学试题广东省惠州市2021届高三二模数学试题(已下线)第10题 平面 向量的数量积-2021年高考数学真题逐题揭秘与以例及类(新高考全国Ⅰ卷)
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4 . 已知
,设函数
,当
时,
取得最小值,则
在
方向上的投影为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91cb77960d8388f5d4e7379b9566e4c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/536ca2ef48cb2ed6f708d910a42b2661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a62a7a677485fb1a20498e78ed96a25d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2709ca478fb15ea08e8aa55328eae8e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2021-05-11更新
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5卷引用:湖南省“五市十校教研教改共同体”2021届高三下学期5月大联考数学试题
5 . 非零向量
,
,
满足
,
,
的夹角为
,
,则
在
上的投影为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb573cc0f30d5c32cdad1510793f0e7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d53eace043cf6044be9128df5ddd94a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b72494c40e9c7afffd5238fd53e2e3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb573cc0f30d5c32cdad1510793f0e7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
A.2 | B.![]() | C.3 | D.4 |
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2021-04-04更新
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