名校
1 . 在锐角
中,内角A,B,C的对边分别为a,b,c,且
,
.
(1)求角
的大小;
(2)若
,
,求c的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f08ce80e91fdf435a8e3ec05be990e9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a4762c4f8f5d8fcfb28a54e5159d307.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83e168d0526b037e91a108cfafb071eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87997b44fdf1a4f5e9a1344c03ab4d82.png)
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名校
2 . 已知向量
,
,
.
(1)若
,求实数
,
的值;
(2)若
,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daaf346e95acdec46177526944b1945a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3330a4c7e5ba2103f30ebabf0921f60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9812303d2eba23689974e92f314cfb55.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b19ad8c709c75f6625ee36ba4a4d07d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c1a869384402cbc7c98d39627780b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次