1 . 如图,在四边形ABCD中,
,
,E是线段CD上的点,直线BD与直线AE相交于点P,设
,
,
.
,
,
,E是线段CD的中点,求与
同向的单位向量的坐标;
(2)若
,用
,
表示
,并求出实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d730ae4307db56b47849c3a19dedfb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4575a365b8e619654a7327d216f23783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfca12290a98993f84d7ee4b8caaa9d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d587e96eb8c73f677da202d5255b690b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/711f1c9e52c41b71e16c8dc85a58eae2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28e3a62c262064b5ea919da7eab436de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d231ae53e3341fec3e56bc59b3acaed3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78c04646983028a2088682a2c116672d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6df2d9d2afb376c3c54894b915705f4.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39e7b83a2497d1662d1a95ec4cbb7495.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2173a791f504749b01c97b951be4b940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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2022-05-02更新
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