“多变”训练是指解完一道题后，对正确解题思路作进一步整理与归纳，寻找其它解法，或对原题进行引伸与发展。这样做既有助于学生理解知识，又有利于训练学生严密、深刻、灵活的思维品质，提高解题能力。在教学中，我注重了一题多解、一题多想、一题多变的“多变”训练，取得 “Changeable” training refers to the solution of a problem, the correct solution to the problem of thinking for further collation and induction, to find other solutions, or the original title of the extension and development. This will help students not only understand the knowledge, but also conducive to training students tight, deep, flexible thinking quality, improve problem solving skills. In teaching, I have focused on one problem and multiple solutions, one question and one thought, one questionable and changeable “changeable” training, and achieved