名校
1 . 已知平面向量
满足
,则以下说法正确的有个.
①
;
②对于平面内任一向量
,有且只有一对实数
,
使
;
③若
,且
,则
的范围为
;
④设
,且
在
处取得最小值,当
时,则
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae951e0bb5a2a406f1572fc1e4964265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d47bf8ef2a26804324c09d68224989c.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd081a9ec7b2a661b3a67f4056f92af8.png)
②对于平面内任一向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f7a1df960feef63dec4790d63f52279.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75b5dc876d7dcd3c971b36d26668b1e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7345f310975ddb40dca94b5135c35dad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b17dccc8c6fab3b746aae078bef9c12.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/540ccd15435aa2d59e809d6a28fb2467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/960f1f384a2f2c010bd57b4c4e6e2233.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb56b1fe3f72a01088d4bc77df537105.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f04583c50ea954ea0757e237a1aa954.png)
④设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9e739722ca5e1a7bbd8ee1109ac5dee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0fb74ad8abb9f4b211557977722d27e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d9fd58e71dcae6cafaf9037d20ebd76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/625306c90a9fd5b1b3ab1fe8d9d0a211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09e82f429787a549656cab36004e9618.png)
A.1 | B.2 | C.3 | D.4 |
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2020-03-09更新
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2卷引用:2020届四川省成都市第七中学高三第5次阶段性考试数学试题