在棱长为2的正方体
中,P是棱
上一动点,点O是面AC的中心,则
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b6b68b81a05f9f6a53235cc2ef0d16c.png)
更新时间:2022-11-12 15:57:40
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【知识点】 求空间向量的数量积
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填空题-单空题
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较易
(0.85)
【推荐1】在斜三棱柱
中,底面边长和侧棱长都为2,若
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6275ac52a32ff2e7d45e782a3911939.png)
,且
,则
的值为________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e852cea228ddd30cb2431cb4fbd7d7a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6275ac52a32ff2e7d45e782a3911939.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ee72ce4f36a71e410d36eba1fb97037.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce6eb2c0c1b3f47e344a4d0c49286a0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9763beafbd239f6e4491d825ff2c7f55.png)
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