在 △ABC 中,已知 AB =
,AC =
,BC =
,有一点 D 使得 AD 平分 BC ,且∠ADB =90°,比值
能写成
的形式 ,这里 m 、n 是互质的正整数.则 m +n =_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/985ea35e6ac053e6c30769cd1706d1a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180c9efbc1f04ec3336259832fc9c76b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24291703cdec1e3d85e96779ed3c3647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b591c1d0d59d6ece8719377206c51f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e61154455cdd8f03a63be98faebe6da.png)
更新时间:2018-12-21 16:25:09
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