在比较大小和不等式证明的教学中,很多师生不关注比较大小和不等式证明的方法之母—作差比较法,而片面追求技巧性强的方法,如放缩法、换元法、构造法、借助常见不等式等,与高中数学教学新理念不和谐,应收敛.作差比较法下手快,目标明,利于解题思维推进,符合高考命题原则,值得关注.本文略举数例说明,旨在抛砖引玉. In the teaching of comparatively large size and inequality, many teachers and students do not pay attention to the mother-of-difference comparison method of comparatively large size and inequality proofs, and one-sidedly pursue highly skillful methods such as deflation method, substitution method and construction method , With the help of common inequalities and other new concepts of high school mathematics teaching is not in harmony, should be convergence. Difference comparison method to start fast, target Ming, conducive to solving the problem thinking, in line with the college entrance examination propositions, is worth noting. In the startling.