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1、第第26章章二次函数二次函数3.3.实践与探索实践与探索 知知 识识 管管 理理 学学 习习 指指 南南 归归 类类 探探 究究 当当 堂堂 测测 评评 分分 层层 作作 业业 第第1课时二次函数与一元二次方程、一元二次不等式的关系课时二次函数与一元二次方程、一元二次不等式的关系第26章二次函数3.实践与探索知识管理学习1学学 习习 指指 南南学习指南2九年级数学下册第26章二次函数263实践与探索第2课时课件新版华东师大版3 知知 识识 管管 理理有两个交点 有一个交点 没有交点 知识管理有两个交点有一个交点没有交点4有两个不相等的实数根 有两个相等的实数根 没有实数根 有两个不相等的实数根
2、有两个相等的实数根没有实数根5 归归 类类 探探 究究 B 归类探究B6九年级数学下册第26章二次函数263实践与探索第2课时课件新版华东师大版7 8九年级数学下册第26章二次函数263实践与探索第2课时课件新版华东师大版9九年级数学下册第26章二次函数263实践与探索第2课时课件新版华东师大版10九年级数学下册第26章二次函数263实践与探索第2课时课件新版华东师大版11九年级数学下册第26章二次函数263实践与探索第2课时课件新版华东师大版12 当当 堂堂 测测 评评 A C 当堂测评AC13yx22x 1或3 x0或x2 0 x2 yx22x1或3x0或x20 x214 分分 层层 作作
3、 业业B 分层作业B15D (2，0)D(2，0)16(3，0)(3，0)17x1或x4 x1或x418D D19九年级数学下册第26章二次函数263实践与探索第2课时课件新版华东师大版20D D21九年级数学下册第26章二次函数263实践与探索第2课时课件新版华东师大版22全文结束！再见全文结束！再见o study whether experiences during teen years would influence adult health.So they followed 171 teens,starting when the kids were just 13.They inter
4、viewed each one every year for five years，and also spoke to these teens closest friends，who provided additional information about the quality of their friendships.The same 171 people were interviewed again at ages 25,26 and 27.This time,the questions surveyed each persons overall health.When the res
5、earchers analyzed the data,they found a strong connection between a teens behavior and adult health.Teens who had close friends grew up to be the healthier adults.Whether teens held back their feelings or expressed them to close friends also influenced later health.Those who held back their feelings
6、 were more likely to be sick as adults.The connection held up even after the scientists accounted for other possible influences on health.Weight，family income and drug use were all examined.So were mental health issues，such as anxiety and depression.And in these people，such other factors did not exp
7、lain adult health as well as teen friendships did.Getting along with the crowd may have benefits,says Allen,but there are also drawbacks.Teens who are more independent tend to do better at school and work.And peer pressure may lead some kids to engage in risky behavior,such as smoking,drinking or using drugs.Dealing with it is an ongoing challenge，Allen acknowledges.“Finding the right balance is the key.Teens shouldnt lose heart for not finding this easy.”And,he adds，“Parents need to be understanding about the pressures teens face.”全文结束！再见o study whether experie23
九年级数学下册第26章二次函数263实践与探索第2课时课件新版华东师大版
