初三二次函数的学习前,一定要做好复习工作,为新课的学习做好准备;学习二次函数时帮助学生亲自画图,从画图的过程中感受二次函数图象的形状和基本性质,以便数形结合记忆二次函数图象的性质和应用;引导学生认识各种二次函数图象之间的联系;引导学生利用二次函数灵活解决实际问题。 Before the third and fourth functions of learning, we must do a good job review for the new class to prepare for learning; learn quadratic function to help students personally drawing, from the drawing process feel the quadratic function of the image shape and basic Nature, in order to combine the nature of the quadratic function image and the application of digital form; to guide students to recognize the connection between various quadratic function images; to guide students to use quadratic function to flexibly solve practical problems.