:2019春九年级数学下册第二章二次函数提升练习（北师大版）
"二次函数"
章末小结与提升
{■("二次函数描述的关系" {■("实际问题" @"二次函数概念" )┤@"二次函数" y=ax^2 "的平移" {■("上、下平移|" k"|个单位长度:" ▁(" " y=ax^2+k" " )@"左、右平移|" h"|个单位长度:" y=a"(" x"-" h")" ^2@"上、下平移|" k"|个单位长度,左、右平移|" h"|个单位长度:" y=a"(" x"-" h")" ^2+k)┤@"二次函数" y=ax^2+bx+c"的图象及性质" {■("开口方向:" a>0",开口向上;" a<0",开口向下" @"对称轴:" ▁(" 直线" x="-" b/2a " " )@"顶点坐标:" ("-" b/2a "," (4ac"-" b^2)/4a)@"增减性" {■(a>0{■(x>"-" b/2a "时," y"随" x"的增大而增大" @x<"-" b/2a "时," y"随" x"的增大而" ▁(" 减小 " ))┤@a<0{■(x>"-" b/2a "时,&
章末小结与提升
{■("二次函数描述的关系" {■("实际问题" @"二次函数概念" )┤@"二次函数" y=ax^2 "的平移" {■("上、下平移|" k"|个单位长度:" ▁(" " y=ax^2+k" " )@"左、右平移|" h"|个单位长度:" y=a"(" x"-" h")" ^2@"上、下平移|" k"|个单位长度,左、右平移|" h"|个单位长度:" y=a"(" x"-" h")" ^2+k)┤@"二次函数" y=ax^2+bx+c"的图象及性质" {■("开口方向:" a>0",开口向上;" a<0",开口向下" @"对称轴:" ▁(" 直线" x="-" b/2a " " )@"顶点坐标:" ("-" b/2a "," (4ac"-" b^2)/4a)@"增减性" {■(a>0{■(x>"-" b/2a "时," y"随" x"的增大而增大" @x<"-" b/2a "时," y"随" x"的增大而" ▁(" 减小 " ))┤@a<0{■(x>"-" b/2a "时,&
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