题干

甲、乙、丙、丁四人参加跳远比赛,老师问他们比赛的结果.

甲说:“丙第一,我第三”.

乙说:“我第一,丁第四”.

丙说:“丁第二,我第三”

丁没说话.

实际上甲、乙、丙三人都只说对了一半,请你说出这四人这次比赛所得的名次.

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答案(点此获取答案解析)

解:因为甲、乙、丙三人都只说对了一半,

假设甲说的“丙是第一名”正确的,

那么丙说的,丁第二就是正确的,

而乙说他第一就是正确的

所以甲就是第三,那么甲说的话就是全对的,这与甲、乙、丙三人都只说对了一半矛盾.

所以甲说他我第三是对的;

那么丙说的丁第二就是对的;

乙说的他第一是对的,

所以丙就是第四.

答:甲是第三,乙是第一,丙是第四,丁是第二.

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