2018年秋九年级数学上册第22章二次函数22.3实际问题与二次函数22.3.1几何图形面积问题(预习)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22.3实际问题与二次函数22.3.1几何图形面积问题(预习)课件(新版)新人教版.ppt_第1页
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第二十二章 二次函数,22.3 实际问题与二次函数,第二十二章 二次函数,第1课时 二次函数与图形面积问题,第1课时 二次函数与图形面积问题,探究新知,活动1 知识准备,1矩形的两边长分别为a,b,则它的面积是_; 2三角形的底边长为a,底边上的高为h,则面积是_; 3在解决最值问题时,主要利用二次函数的哪些性质? (1)利用二次函数图象的_来解决最值问题; (2)利用二次函数在某个范围内的_来解决最值问题,ab,顶点,增减性,第1课时 二次函数与图形面积问题,活动2 教材导学,(20x),x(20x),10,10,第1课时 二次函数与图形面积问题,0x20,20,200,

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