弱智来答第二道：EF与AC之间的交差点设为p，求阴影APE＋阴影APB的面积。CFP的面积不用算，在十十一一中抵消。

来源: 喜爱温泉于 2017-06-13 18:36:03 [旧帖] [给我悄悄话] 本文已被阅读：次

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