论文部分内容阅读
二次函数中二次项系数问题包含的知识面广,综合性强,题型灵活多变,因而对于这类问题教师讲了很多题,学生还是频频失误,其实不在于做了多少,而在于有没有让学生拨开云雾,抓住问题本质.这就需要教师设计一题多变,由浅入深,举一反三,让学生在训练中不断提升分析问题和解决问题的能力及创新能力.下面以2014年一道中考真题为例加以说明.例关于x的函数y=(2m-1)2x-(2m+2)x+2的图像与x轴只有一个交点,求m的值.解析:学生在解题过程中审题不严,片面断定题设为二次函数,从而漏解.根据二次函数定义:一般地,形
Quadratic function coefficient of the quadratic coefficient contains a wide range of knowledge, strong comprehensive, flexible and question type, so for teachers of this type of problem a lot of questions, or students frequently mistakes, in fact, not how much has been done, but rather Whether to allow students to get rid of the clouds, to seize the essence of the problem.This requires teachers to design a changeable, from the shallow to the upper hand, giving top priority to enable students to continuously improve the analysis and problem-solving skills and innovation ability below 2014 Years of a senior high school entrance examination Zhenti as an example to illustrate.Examples on the x function y = (2m-1) 2x- (2m +2) x +2 image and the x-axis only one intersection, find the value of m. In the process of examining the problem lax, one-sided ruled that questions set as a quadratic function, and thus leakage. According to the definition of quadratic function: In general,