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一旅游者从下午3时步行到晚上7时,他先走平 …
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一旅游者从下午3时步行到晚上7时,他先走平 …
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一旅游者从下午3时步行到晚上7时,他先走平路,然后登山,到山顶后又沿原路下山回到出发点,已知他走平路时每小时走4千米,爬山时每小时走3千米,下山时每 ...
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