解ï¼è®¾ï¼BC = 40ï¼AC = 30ï¼â C = 90°ï¼åAB = 50ï¼ABè¾¹ä¸çé«CD = 30X40/50 = 24
设ç©å½¢çé¿ä¸ºxï¼å®½ä¸ºy,åï¼
x/50 = (24-y)/24
x = 25(24-y)/12
ç©å½¢çé¢ç§¯S = xy = y*25(24-y)/12
=25(24y-y�0�5 )/12
=-(y - 12)�0�5 *25/12 + 300
å½y = 12æ¶ï¼Sæ大 = 300(m�0�5 )
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