2018年秋九年级数学上册第二十二章二次函数22.1二次函数的图象和性质22.1.1二次函数预习学案(新版)新人教版.doc

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2018年秋九年级数学上册第二十二章二次函数22.1二次函数的图象和性质22.1.1二次函数预习学案(新版)新人教版.doc_第1页
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122.1.1 二次函数一、预习目标及范 围:1.结合具体情境体会二次函数的意义,理解二次函数的有关概念.2.能够表示简单变量之间的二次函数关系 .3.预习范围 课本 2829页二、预习要点1.一般地,形如 的函数,叫做二次函数.2. 举出几种不同形式的二 次函数 . 三、预习检测1 .下列函数中, (x 是自变量) ,是二次函数的为( )A.y=ax2+bx+c B.y2=x2-4x+1C.y=x2 D.y=2+ 1x2.函数 y=(m-n)x 2+ mx+n 是二次函数的条件是( )A.m,n 是常数,且 m0 B. m,n 是常数,且 n0C.m,n 是常数,且 mn D.m,n 为任何实数我的疑惑在预习过程中的存在哪些困惑与建议填写在下面,并与同学交流 。_2_3参考答案预习要点1.y=ax2+bx+c( 是常数)0, 、 2.略预习检测:1.C2.C

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