2019年中考数学总复习第三单元函数第15课时二次函数的图象和性质二课件湘教版201901151140.pptx

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UNIT THREE,第三单元 函数及其图象,第 15 课时 二次函数的图象和性质(二),考点一 二次函数与一元二次方程的关系,考点聚焦,不相等,相等,没有,考点三 二次函数图象的平移,对点演练,题组一 教材题,C,-1或2,题组二 易错题,A,C,B,0或-1,探究一 二次函数与一元二次方程的关系,【命题角度】 (1)已知二次函数的图象与x轴交点个数,求字母的取值范围; (2)利用二次函数图象的对称性,求一元二次方程的解; (3)二次函数与一元二次方程根的判别式的综合运用.,针对训练,探究二 二次函数的图象的几何变换,【命题角度】 (1)求平移后的图象所对应的函数表达式; (2)求抛物线翻折后的表达式.,针对训练,A,探究三 二次函数的系数与图象之间的关系,【命题角度】 根据函数图象推断系数间的关系.,图15-2,针对训练,图15-3,图15-4,探究四 二次函数在几何中的应用,【命题角度】 二次函数的图象与性质在几何图形中的综合运用.,图15-5,图15-5,针对训练,图15-6,图15-6,图15-6,

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