問題詳情
19. 圖(七)是△ABC與△DBE重疊的情形，其中C在 
上，且 
=9， 
=7， 
=6。若∠DEB=α，∠DBE=β，則∠ABD=?
(A) 
(B) α - β
(C) 180° - α - β
(D) 180° - α - 2β
參考答案
無參考答案
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