众所周知,数学证明按其方式可分为直接证明与间接证明两种;在教学过程中,常常要用到属于直接证明的分析法和属于间接证明的反证法,两者方法不同,但也有共同的特点。学生对这二种方法模糊不清,教师要启发学生掌握这二种不同方法的区别和联系。 As we all know, mathematical proof can be divided into direct proof and indirect proof according to its method. In the process of teaching, it is often necessary to use analytic method which belongs to direct proof and negative proof which belongs to indirect proof, which have different methods but also have common features . Students vague these two methods, teachers should inspire students to grasp the difference between the two different methods and connections.