20-21高一下·浙江·期末
名校
1 . (1)已知向量
,
,
,且
,
.求
的值.
![](https://img.xkw.com/dksih/QBM/2021/5/19/2724632615411712/2724643871678464/STEM/053bcad8bf3f48b288d2ade08668acbc.png?resizew=270)
(2)如图所示,在
中,D,F分别为线段
,
上一点,且
,
,
和
相交于点E,若
,分别求出
与
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e705609358b31101cb6548e7effce65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ba2ac7171255c62378b9dfd07ab112e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46fb52ac34837743dd25a10c9f099c34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/523c74d21b7934a09348b1a01e1ae606.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d69338627d036462f9f48183b59521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fdc21ca552c1e92e4ba53db19b6b17b.png)
![](https://img.xkw.com/dksih/QBM/2021/5/19/2724632615411712/2724643871678464/STEM/053bcad8bf3f48b288d2ade08668acbc.png?resizew=270)
(2)如图所示,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b6bef27de230acad352f25e954f4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d127d5639a8b81a93d75ff4626060c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47367753e45205dc8c948e0657f0cb19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
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