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二次函数是初中代数教材中最重要、最丰富的内容之一，它几乎涉及到初中代数教材中各个部分的基础知识，具有较强的综合性，是同学们感觉较难的一部分内容．同时它又是进一步学习高中数学的基础．因此学好这部分内容显得尤为重要．那么怎样才能掌握好这部分内容呢？首先要正确
The quadratic function is one of the most important and most abundant contents of junior middle school algebra textbooks. It almost involves the basic knowledge of each part of the junior middle school algebra textbooks. It has a strong comprehensiveness and is a part of the students’ feelings of difficulty. At the same time it is the basis for further study of high school mathematics. Therefore, it is very important to learn this part. How can we master this part? Be correct first