=0.75*0.25*0.25+0.25*0.75*0.25+0.25*0.25*0.75

來源: (樂哈哈) 於 2010-01-11 20:09:22 [] [舊帖] [給我悄悄話] 閱讀數 : (54 bytes)

=0.75*0.25*0.25+0.25*0.75*0.25+0.25*0.25*0.75
=9/64

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