在平常的学习中,我们不乏周而复始、简单重复的解题训练。对于一些习题,具有较强的示范性。在教学中教师要善于以这些习题为原型,引导学生进行适当引申、拓展和解题后的反思。这样不仅能充分发掘习题的潜在教学价值,而且对于提高学生学习积极性,培养探索性和创新精神大有帮助。本文仅对一道习题结论加以引申、拓展,供读者参考。 In normal learning, we have many repetitive, simple and repetitive problem-solving training. For some exercises, with a strong demonstration. In teaching teachers should be good at using these exercises as a prototype, and guide students to appropriate extension, expansion and reflection after the solution. This will not only fully explore the potential teaching value of exercises, but also to improve students’ enthusiasm for learning, exploration and innovative spirit of great help. This article only extended to a conclusion of exercises, expand, for readers reference.