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二次函数是初中代数的重要内容之一,也是各地中考试题中重点考查的知识点之一,解有关二次函数的问题时比较容易出错,为了帮助同学们深刻掌握这部分知识,在解题时减少失误,本文对几种容易产生错误的情况作简单的分析列举如下,以供借鉴.一、对二次函数及其性质理解不透彻致错例1如果二次函数y=x~2-6x+c的图像过点A(-1,y_1),B(2,y_2),C(3+2~(1/2),y_3),那么y_1、y_2、y_3的大小
The quadratic function is one of the important contents of junior high school algebra. It is also one of the knowledge points that focus on the middle school exam questions. It is easy to make mistakes when solving the quadratic function problems. In order to help students master this part of knowledge deeply, When reducing the number of mistakes, this article makes a simple analysis of several kinds of situations that are easy to produce mistakes, as follows: First, the understanding of the quadratic function and its properties is not thorough enough. Example 1 If the quadratic function y = x ~ 2- 6x + c is over A (-1, y_1), B (2, y_2), C (3 + 2 ~ (1/2), y_3), then the size of y_1, y_2, y_3