对课本的例题、习题进行变式引申是研究数学问题不可缺少的手段,也是数学复习的重要武器.它有利于提高我们的发现意识、解题能力,更有利于锻炼我们的创新思维和良好的学习品质.本文就课本一道例题做如下探究. Exercises on textbook examples, exercises variant variants is an indispensable means of mathematical problems, but also an important tool for mathematical review.It helps to improve our sense of discovery, problem solving skills, but also more conducive to exercise our innovative thinking and good Learning quality.This article on textbook example to explore as follows.