S@DEF = 1/2515 - 25 = 12.5, so ED =FD = 5, AB=AF =10

來源: 進進出出250 於 2025-04-24 07:20:37 [舊帖] [給我悄悄話] 本文已被閱讀：次

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S@DEF = 1/2*5*15 - 25 = 12.5, so ED =FD = 5, AB=AF =10