G·波利亚曾经说过：“数学技能就是解题能力——不仅能解决一般的问题，而且能解决需要某种程度的独立思考，判断力，独创性和想象力的问题”．在某种意义上讲，高中数学教学的重点是解题教学．然而，在教学中我们常会碰到这样的情况，有的学生一听就会，但一解就错．在高考中 G. Polya once said: “Mathematical skills are problem-solving abilities -- not only solving general problems, but also solving problems that require some degree of independent thinking, judgment, originality, and imagination.” In a sense, the focus of high school mathematics teaching is to solve problem teaching. However, we often encounter such a situation in teaching. Some students will hear it, but the solution is wrong. In the college entrance examination