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1729题目有矛盾啊他们一起出门上学，同一时间上课。有的情况下他们是不可能同时到达学校的（比如本题例题）。 请教大脚了，这是什么意思啊。 如果不要求同时到学校，那么他们之间的距离完全可以更远些--7.62。不理解啊，跪求了 Followed by:
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