1 . 已知
是单位向量,在四边形ABCD中,
,
,
则四边形ABCD的形状为_________ .(矩形、正方形、菱形、梯形).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dc64abe49847ade9b78678ba1f8e0e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b941a162934d1b8b2631751b9809b834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1805c7f400adbdff37f22e4e7eec489f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f568862fde994aaeb15ddd13ebc4d477.png)
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解题方法
2 . 平面向量
满足
,则
的最小值为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b412d3054ea69685032f777669e41e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ea784e68a38ee015ebad28270d43917.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40ec2de2d6ac927d41181842c988fb5d.png)
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2022-05-22更新
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2843次组卷
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3卷引用:浙江省嘉兴市海宁市2022届高三下学期5月适应性考试数学试题
3 . 已知
是两个非零向量,且
,
,则
的最大值为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64fa2fcefaf3d8868da0cb52877c5247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e7f14dfa9f463d57664c640102bb5b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f840d46934fd4a0f9a84df7e8c06cd95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/859977dfe22068c3c50c9c19087bb144.png)
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