1 . 已知集合
,
,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd938a7cbe57a0df040e2dc193a1de07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3adb1973dc74c60308b1efd84a99c377.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c81919684bc4047d376c7e57dc6c8f1c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2020-03-01更新
|
445次组卷
|
2卷引用:2004 年普通高等学校招生考试数学(理)试题(安徽卷)
真题
解题方法
2 . 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)
您最近一年使用:0次
真题
3 . 在平行四边形ABCD中,AC为一条对角线,若
,
,则![](https://img.xkw.com/dksih/QBM/2010/3/30/1569685154979840/1569685228281856/STEM/56ce97b14400471da5bc1994abaa5964.png)
![](https://img.xkw.com/dksih/QBM/2010/3/30/1569685154979840/1569685228281856/STEM/27989a15350d4fe285341790229e76c2.png)
![](https://img.xkw.com/dksih/QBM/2010/3/30/1569685154979840/1569685228281856/STEM/8f6c002b91354ba382e8966980906c97.png)
![](https://img.xkw.com/dksih/QBM/2010/3/30/1569685154979840/1569685228281856/STEM/56ce97b14400471da5bc1994abaa5964.png)
A.(-2,-4) | B.(-3,-5) | C.(3,5) | D.(2,4) |
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