从①
,②
,③
这三个条件中任选一个,补充在下面的问题中,并加以解答.
已知△ABC的内角A,B,C所对的边分别为a,b,c,若___________,且
,证明:△ABC是等边三角形.
注:如果选择多个条件分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeed1530d994004214b94e1b43b9ec39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d80b6a016dbcf4d5ceadb8ba741829ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a565df2a9827e9727dc2f0dbf6d925e.png)
已知△ABC的内角A,B,C所对的边分别为a,b,c,若___________,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/988b7e964e313579ab8869d67d5be007.png)
注:如果选择多个条件分别解答,按第一个解答计分.
更新时间:2022-04-19 18:35:06
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