在小學奧數中稱為蝴蝶模型，請看圖

來源: 萬斤油於 2021-06-06 08:39:48 [博客] [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.