在△ABC中，a=3，b= 6 ，∠A= 2π3 ，则∠B=_1．

题干

在△ABC中，a=3，b= 6 ，∠A= π

2

3

，则∠B=____．

上一题下一题 0.0难度选择题更新时间:2018-09-30 04:12:10

π

4

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