已知非零向量
、
满足
,则向量
与
的夹角为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
更新时间:2024-06-01 13:18:17
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【推荐1】如图,在四边形ABCD中,
,
,
,且
,
则实数
的值为__________ ,若M,N是线段BC上的动点,且
,则
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【推荐2】在
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【推荐1】正
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,过
的动直线
与边
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②若
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其中所有正确结论的序号是______ .
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①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d5cce8256cbd50299a26044f05fc086.png)
②若
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③
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④
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【推荐2】如图,在
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【推荐2】在
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为锐角三角形;
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是
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一定过
的重心;
④
是
内一定点,且
,则
;
⑤若
,且
,则
为等边三角形.
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①
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②若
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③
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④
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⑤若
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【推荐1】抛物线
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