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三年级数学思维训练：归一问题，6台车床5小时可加工多少个零件？
归一问题：3台车床4小时可以加工零件240个，照这样计算，6台车床5小时可加工多少个零件？5台车床加工600个需要多少个小时？
三年级数学思维训练：36个专题，系统课程，全面提升！173/194
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