(1)对于平面向量
,
,求证:
,并说明等号成立的条件;
(2)对于任意的
,
求证:
;
(3)求
的最大值.
![](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/7c3a6e4ff5a1a5977357f04020df2322.png)
(2)对于任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32ac12138178cb539a9e1c8f77587038.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cc888cdc660dc71f51d100fc7746eaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920a38dd1573498365963519c3bd2daa.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61c5e59b2552eb5f033aea9e034e87ba.png)
更新时间:2021-08-02 08:32:06
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【推荐2】已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/328f41294c3421fac0eccb30c0d6667e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3321a6c9b4af731ee336ad51fca76c7.png)
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