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圖在哪裡呀?我猜D點在線段AB的下方,F點在線段AB的上方.由題意知道三角形FCB和三角形BAD是全等直角三角形,角DBA等於角BFC,因為角CBF和角BFC是直角三角形的兩個銳角,之和是90度,角FBD=角DBA+角CBF=角BFC+角CBF=90度.
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