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问题239两种解法看似都很合理,但结果却不同,难道是题目错了?本问题共收到评析稿件23篇,14位读者认为解法1错误、解法2正确,6位读者认为解法1正确、解法2错误,另外3位读者认为解法1错误但解法2也不完全正确.比较一致的意见是:之所以出现两种不同的解法,主要是对全称命题与特称命题的逻辑关系理解不透彻,对命题进行否定时出现错误.来稿前三名的作者是:王安寓(江苏省南京市六
Problem 239 Both solutions seem reasonable, but the result is different, is it the wrong title? This question has received a total of 23 articles for review, 14 readers think solution 1 error, solution 2 is correct, 6 readers think solution 1 Correct, solution 2 error, the other three readers think solution 1 error, but solution 2 is not entirely correct.A consensus opinion is: the reason why there are two different solutions, mainly the logical relationship between the full title and the special title proposition understanding Not thorough, the proposition is negative when there is an error. The authors of the top three contributions are: Wang An apartment (Nanjing, Jiangsu Province, six