已知空间向量
,
,则
是
的______ 条件.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7362e601c539f4f63beeac9af20aa106.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ac52fd6d4ada3d2d0af0010c5b848e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500d68f2678989a5ce7431cfd51b019d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb58883caf5c8ca1e94389839d294b6.png)
11-12高二上·江苏盐城·期末 查看更多[2]
更新时间:2016-11-30 13:39:39
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【推荐1】“
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【推荐2】下列命题中:①若
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;②“
”是“
”的充分不必要条件;③若
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;④“
”是“
”的必要不充分条件,上述命题中正确命题的序号______ .
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【推荐1】如图,在长方体
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解题方法
【推荐2】如图,在棱长为4的正方体
中,点P是线段AC上的动点(包含端点),点E在线段
上,且
,给出下列四个结论:
平面
;
②存在点P,使得
是等腰直角三角形;
③若
,则点P轨迹的长度为
;
④当
时,则平面
截正方体
所得截面图形的面积为18.
其中所有正确结论的序号是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73845d4d663b3de0b281611fe2c762fe.png)
②存在点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0058da71a42b3992b8f25ad1a5089b5.png)
③若
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④当
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其中所有正确结论的序号是
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