在日常的解题活动中经常会遇到这种情形:一不留神换来全盘皆输,求解看似合情合理,实则毫无道理.错得毫不知情,因为防不胜防,其实出错的原因就是没有弄清问题的实质,看问题似是而非.以下几个问题都是似是而非的问题. In the daily problem-solving activities often encounter this situation: an inattention in exchange for the omnipotent are lost, the solution seems plausible, but in reality there is no truth. Wrong without knowing, because it is hard to be in vain, in fact, the reason is wrong To clarify the essence of the problem and to see whether the problem is plausible, the following questions are paradoxical issues.