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五年级数学上册解方程 同步课堂 相遇问题 不会列方程的看过来
两列火车从相距600千米的两地同时相向开出。甲车每小时行驶230千米，乙车每小时行驶170千米，经过几小时两车相遇？
五上数学同步课堂42/92
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