△ABC的三个内角A、B、C满足:A=3B=9C,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e83d4c34d438fe00a6790860164d2f0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/740cdcded74b4997596482742710c24e.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e83d4c34d438fe00a6790860164d2f0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/740cdcded74b4997596482742710c24e.png)
2019高三·江西·竞赛 查看更多[1]
更新时间:2020-05-11 21:08:08
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【知识点】 三角恒等式、不等式、最值
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【推荐2】已知顶角为
的等腰三角形的底边长为
,腰长为
.则
的值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aee6e4e9350a2665df8597ff8045bbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a212fec12534d4add683c64e4fc96116.png)
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