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如图,AC、BC是两条交叉的街道,P为邮局,现在要在AC,BC街上各安装一个邮筒,使得邮递员从邮局出发,先去AC街取信件,再到BC街取信件后,最后回到邮局P所走的路径最短,试确定安装的地点
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教案备课库《七年级数学作业轴对称作业》真题及答案
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