定义:
,其中
为向量
与
的夹角,若
,
,则
等于_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9a1a30135a03096091abc62e60e5237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a64d456b7cb614f7964c2d75d9ebc572.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83931a67bede539d6f9b09fcdfabce50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/900325e7bcef1a011dd02f8315cb9dbe.png)
更新时间:2023-03-19 23:05:05
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相似题推荐
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适中
(0.65)
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解题方法
【推荐1】平行四边形
中,
,
,
,点P在边
上,则
的取值范围是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f7fa26078dc2c5d8243edfa6ddb7f3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59880e470359d8e9faf6ae5ce155cf2a.png)
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【推荐2】已知
,
,
与
垂直,则
与
的夹角为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ae0d7b3266f32b6a916b6237b6b838.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df42687a73cb92e92a3cb6e54f1edb15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c0b7d8561eccfd0338c914ba3e66836.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
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填空题-单空题
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适中
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真题
解题方法
【推荐1】已知两个不相等的非零向量
两组向量
和
均由2个
和3个
排列而成.记
,
表示
所有可能取值中的最小值.则下列命题的是_________ (写出所有正确命题的编号).
①
有5个不同的值.
②若
则
与
无关.
③若
则
与
无关.
④若
,则
.
⑤若
,则
与
的夹角为
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449389568/STEM/2884b7b595114f89bb7ab3d0673e6e6e.png?resizew=31)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449389568/STEM/0056039fb96b42559d74f2259cb9f8e4.png?resizew=97)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449389568/STEM/426b2263f7c44dc0b3d8446b06fdc663.png?resizew=103)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449389568/STEM/58f84f3d0a244cd88078e91087293ef5.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449389568/STEM/49970af3c16c424c82b4cbb5d2cd3331.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449389568/STEM/80cd545ab75b45cabab82b729d7a93df.png?resizew=271)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449389568/STEM/4d90fe5293274eb19259fbb0b120d1ef.png?resizew=29)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449389568/STEM/3750dd65ae4e4374b799b214494569c7.png?resizew=15)
①
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449389568/STEM/3750dd65ae4e4374b799b214494569c7.png?resizew=15)
②若
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449389568/STEM/eb224b8a4bdc44569990b8816918e8d8.png?resizew=43)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449389568/STEM/4d90fe5293274eb19259fbb0b120d1ef.png?resizew=29)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449389568/STEM/079c7b52cc214f04b741adf719d73cb5.png?resizew=17)
③若
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449389568/STEM/5ae2e9a14448410488891b5494767ffb.png?resizew=44)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449389568/STEM/4d90fe5293274eb19259fbb0b120d1ef.png?resizew=29)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449389568/STEM/f979ceb297c546c1833623481366936c.png?resizew=17)
④若
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449389568/STEM/507295ef5108469bb2aaf9e0de6756e5.png?resizew=55)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449389568/STEM/8d4241130b524545a9447bcca313ec57.png?resizew=55)
⑤若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1893402b021b3ef8ecd162c3f21201b4.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449389568/STEM/58f84f3d0a244cd88078e91087293ef5.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449389568/STEM/49970af3c16c424c82b4cbb5d2cd3331.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449389568/STEM/b5e2d351735c484ebbf25b9067a13b64.png?resizew=17)
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【推荐2】设V是已知平面M上素有向量的集合,对于映射
,记
的象为
.若映射
满足:对所有
及任意实数
都有
,则f称为平面M上的线性变换,现有下列命题:
①设f是平面M上的线性变换,
,则
;
②若
是平面M上的单位向量,对
,设
,则f是平面M上的线性变换;
③对
,设
,则f是平面M上的线性变换;
④设f是平面M上的线性变换,
,则对任意实数k均有
.
其中的真命题是______ (写出所有真命题的编号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc2729781bb5463052e584670e3a08e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860c3534162afd05b26e89f66644a421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93cb56c7a28cc5308589415a77ae0ebc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b20d526e4972456824a0161d24e85ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ec6fb9e0625b85be3103d317fbb0cca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6ae60fc29244d9a9c6af2d8b87b5185.png)
①设f是平面M上的线性变换,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b20d526e4972456824a0161d24e85ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/831553e642904143a53dd7fae198abb6.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dc64abe49847ade9b78678ba1f8e0e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6cc1f2197a72186f77a3118bceeae7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0501a9d3848b484a2e97d92a896d943.png)
③对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6cc1f2197a72186f77a3118bceeae7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29b6d0c16618b9b7d5028eead0c6a7b4.png)
④设f是平面M上的线性变换,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6cc1f2197a72186f77a3118bceeae7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/945453c097d96501aec6604c68fa3798.png)
其中的真命题是
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