確實不夠嚴謹，被樓主看出了；不過FDH和BCH是相似的，所以FD是邊長的一半；BE類似

來源: monseigneur 於 2026-03-13 09:57:10 [舊帖] [給我悄悄話] 本文已被閱讀：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.