已知菱形ABCD的边长为1,
,点E为边BC的中点,F为边CD上动点,
![](https://img.xkw.com/dksih/QBM/2022/4/17/2959892772323328/2960305089388544/STEM/1edb1117-cc93-4b5b-a63d-0ccab3bfe8fd.png?resizew=222)
(1)求
;
(2)当点F使得
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd7a42341edbc0b01ab0769c4c02c3e3.png)
![](https://img.xkw.com/dksih/QBM/2022/4/17/2959892772323328/2960305089388544/STEM/1edb1117-cc93-4b5b-a63d-0ccab3bfe8fd.png?resizew=222)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9277b5b330eefe2318c7b4b17576a2bb.png)
(2)当点F使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25d743b418b4f784a1c01701663f8398.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7173b357dec0dca7d6da123345089741.png)
更新时间:2022-04-17 20:59:02
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【推荐1】已知向量
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(2)求
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【推荐1】已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ea9a84a9262e84c0ae8744c0072d6c9.png)
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![](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/7a2f4b1178f68bd147d1a2a6acd04435.png)
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解答题-问答题
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适中
(0.65)
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【推荐1】如图,在
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![](https://img.xkw.com/dksih/QBM/2022/4/11/2955750261260288/2958854152445952/STEM/19f500dc-b765-415b-b83f-df58a2b5f5ac.png?resizew=210)
(1)求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c278812c4813f6391c7993574e2f1.png)
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