到底谁在说假话
- 时间:2020-05-31 15:41:53
- 分类:数学世界
- 阅读:156 次
到底谁在说假话的推理问题:甲说:“乙说假话”,乙说:“丙说假话”,丙说:“甲乙二人都说假话”,问到底是谁在说假话?
数学题解答:这道理可以用假设法来想,如果甲说的“乙说假话”是真话,那么乙说的“丙说假话”是假话,即“丙说真话”,即“甲、乙两人都说真话”,这与一开始假设的甲说真话相矛盾,所以“乙说假话”是假话。
因为甲说假话,所以乙说的“丙说假话”是真话,即“甲乙二人都说假话”是假话。
综合以上分析:甲、丙两人都说假话,乙说真话。
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