更简单点：sABE=84/4=21;AF/FC= sABE/sCBE = 3/4; sABF = 3/7*sABC=18

来源: got66 于 2026-04-30 06:17:37 [旧帖] [给我悄悄话] 本文已被阅读：次

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