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在△ABC中,角A、B、C所对应的边分别为a、b、c,若角A、B、C依次成等差数...
在△ABC中,角A、B、C所对应的边分别为a、b、c,若角A、B、C依次成等差数列,且a=1,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101601951508920/SYS201311031016019515089003_ST/0.png)
等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101601951508920/SYS201311031016019515089003_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101601951508920/SYS201311031016019515089003_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101601951508920/SYS201311031016019515089003_ST/3.png)
D.2
考点分析:
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