弱智來答第二道：EF與AC之間的交差點設為p，求陰影APE＋陰影APB的麵積。CFP的麵積不用算，在十十一一中抵消。

來源: 喜愛溫泉於 2017-06-13 18:36:03 [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.