罗昕同学在文中提出了一个他在学习中不能解决的问题:“反证法是证明无理数的通用方法吗?”并具体列出了三个他不知如何解的题,向诸位老师和同学们请教.我们想这可能也是许多同学曾经思考或将会思考的问题,因此将此文刊登出来,希望诸位老师和同学们帮助罗昕同学,解答他提出的问题,谢谢大家. Luo Xin students put forward a problem that he can not solve in his study: “Anti-syndrome is a common way to prove irrational numbers?” And specifically listed three he did not know how to solve the problem, to your teachers and classmates We think this may also be many students have thought or will be thinking about the issue, so published this article, I hope all the teachers and students to help Luo Xin students to answer his questions, thank you.