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教材分析《整式加减—同类项及合并同类项》这节课选自义务教育课程标准实验教科书华师版《数学》七年级上册第三章第四节的内容.整式加减是在学习有理数的基础上引入字母表示数,使学生的思维实现由数到式的飞跃.整式加减为以后学习一元一次方程和一元一次不等式做好准备.也为后面学习整式乘除、分式与根式等知识做好铺垫.为进一步研究恒等式变形及函数与方程打下基础.起到承前启后、铺路架桥的作用.整式是最基本的代数式,而合并同类项却是整式加减的一个基础法则.结合七年级学生的认知特点、对实际操作活动的浓厚兴趣、对直观事物感知较强等特点,我认真创设教学情境,让学生自己发现规律,从而激发学生的归纳能力,培养数学源于生活又应用于生活辩证思想及通过研究问题总结结论的归纳思想.因此本节课的教学重点为:理解同类项概念,会合并同类项.
Textbook analysis “the whole addition and subtraction - similar items and the merger of similar items” This class is from the compulsory education curriculum standard experimental textbook Chinese version of “Mathematics” seventh grade of the third chapter fourth quarter of the contents of the whole addition and subtraction is to learn the rational number Based on the introduction of alphanumeric characters, so that students achieve a leap in the number of ways to achieve the integral addition and subtraction for the future to learn a one-time equation and a one-time inequality ready, but also for later learning integral multiplication and division, fractional and root knowledge to do So as to lay a foundation for further study on the deformation of isomorphism and the function and the equation, play the role of inheriting the past and paving the bridge, the integral is the basic algebraic formula, and the merger of similar items is an integral rule of integral addition and subtraction. Of the cognitive characteristics of the actual operating activities of the strong interest in perceived strong visual things and other characteristics, I seriously create a teaching situation, so that students find their own laws, so as to stimulate the ability of students induction, mathematics derived from life and applied to life Dialectical thinking and through the summary of the conclusions of the study concluded that the focus of this lesson teaching: understanding of similar items Will merger of similar items.