小强下了几盘棋——比赛中的推理问题(一)
- 时间:2020-03-30 18:18:31
- 分类:数学世界
- 阅读:137 次
例1.甲、乙、丙、丁与小强五位同学一起比赛象棋,每两人都要赛一盘。到现在为止,甲已经赛了四盘,乙赛了三盘,丙赛了两盘,丁赛了一盘。
问:小强赛了几盘?
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