2018年秋九年级数学上册第22章二次函数22.1二次函数的图象和性质22.1.2二次函数y=ax2的图象和性质(听课)课件(新版)新人教版.ppt

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2018年秋九年级数学上册第22章二次函数22.1二次函数的图象和性质22.1.2二次函数y=ax2的图象和性质(听课)课件(新版)新人教版.ppt_第1页
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1、第二十二章 二次函数,22.1 二次函数的图象和性质,总结反思,目标突破,第二十二章 二次函数,知识目标,22.1.2 二次函数yax2的图象和性质,知识目标,22.1.2 二次函数yax2的图象和性质,1根据作函数图象的步骤,能够用描点法作出函数yax2的图象,并能根据图象确定抛物线yax2的开口方向、顶点坐标、对称轴 2通过对比几个二次函数的图象(共同点和不同点),归纳总结二次函数的性质,并能根据其性质解决问题,目标突破,目标一 会画二次函数yax2的图象并求其开口方向、顶点坐标、对称轴,22.1.2 二次函数yax2的图象和性质,22.1.2 二次函数yax2的图象和性质,解:列表如下:

2、22.1.2 二次函数yax2的图象和性质,【归纳总结】抛物线yax2的开口方向、顶点坐标、对称轴的确定: 详见【小结】知识点二表格,22.1.2 二次函数yax2的图象和性质,目标二 会用二次函数yax2的性质解决问题,22.1.2 二次函数yax2的图象和性质,D,22.1.2 二次函数yax2的图象和性质,【归纳总结】当所给的点不都在抛物线对称轴的同一侧时,要根据抛物线的对称性,将点转化为在对称轴同一侧,然后再根据增减性比较函数值的大小,22.1.2 二次函数yax2的图象和性质,总结反思,知识点一 二次函数yax2的图象,22.1.2 二次函数yax2的图象和性质,知识点二 二次函数yax2的性质,22.1.2 二次函数yax2的图象和性质,上,下,22.1.2 二次函数yax2的图象和性质,22.1.2 二次函数yax2的图象和性质,22.1.2 二次函数yax2的图象和性质,

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