常言道:授之以鱼不如授之以渔.课堂教学中要实现这个目标,变式教学是一种比较有效的教学途径.所谓变式教学就是指在老师的指导下,以“问题”为载体,以变式为主要教学方法,不断改变问题的情境或问题呈现形式,提高课堂教学效率的一种教学模式.例题、习题的变式教学,即改变原来例题、习题的某些条件或结论,使之成为一个新题,也称 As the saying goes: to teach the fish as granted to the fishing class teaching to achieve this goal, variant teaching is a more effective way of teaching the so-called variant teaching refers to the teacher’s guidance to As a carrier, with variant as the main teaching methods, constantly changing the situation of the problem or problem presentation, improve classroom teaching efficiency of a teaching model .Examples, exercises teaching variant, that is, to change the original example, some of the conditions of the problem Or conclusion, making it a new title, also known as