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11. 已知△ABC中，∠A =90° 、∠B=60°。若點D為 的中點，則sin∠ABD = ？(A) (B) (C) (D)
問題詳情
11. 已知△ABC中，∠A =90° 、∠B=60°。若點D為
的中點，則sin∠ABD = ？
(A)
(B)
(C)
(D)
參考答案
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