只需一步,快速开始
woaishuijia 发表于 2014-10-23 09:58 static/image/common/back.gif . W4 y, b; q% D8 n& Z1 D你的确漏条件了:左侧和上方红线的交点是三角形的外心
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oxm44 发表于 2014-10-23 10:30 static/image/common/back.gif8 A/ \8 J$ `+ W$ s& [ N, p* N( p/ [ 16楼的问题出在这里:
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