F.5 MATHS.........................
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F.5 MATHS
2010-10-11 2:06 am
回答 (1)
2010-10-11 3:43 am
✔ 最佳答案
(MB + AM)/2 = OB = OC(MB + 18)/2 = OB = OCSoOC^2 = OM^2 + CM^2OC^2 = (OB - MB)^2 + (12/2)^2[(MB + 18)/2]^2 = [ (MB + 18)/2 - MB)^2 + 36[(MB + 18)/2]^2 = [(MB + 18)/2]^2 - 2 ((MB + 18)/2) MB + MB^2 + 36(MB + 18)MB = MB^2 + 36MB^2 + 18MB = MB^2 + 3618MB = 36MB = 2 cm
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20101010000051KK01177