九年级数学上册第22章二次函数小结课件新版新人教版

第二十二章二次函数小结小结类型之一二次函数的图象与性质C

小结D小结小结C小结小结D小结小结D小结小结m≥－1小结小结小结①②③④小结小结小结小结类型之二用待定系数法确定二次函数的解析式小结小结小结类型之三二次函数与一元二次方程、不等式的关系小结B

小结小结C

小结类型之四二次函数的实际应用小结小结类型之五数学活动小结小结小结小结全文结束！再见ostudywhetherexperiencesduringteenyearswouldinfluenceadulthealth.Sotheyfollowed171teens,startingwhenthekidswerejust13.Theyinterviewedeachoneeveryyearforfiveyears，andalsospoketotheseteens’closestfriends，whoprovidedadditionalinformationaboutthequalityoftheirfriendships.Thesame171peoplewereinterviewedagainatages25,26and27.Thistime,thequestionssurveyedeachperson’soverallhealth.Whentheresearchersanalyzedthedata,theyfoundastrongconnectionbetweenateen’sbehaviorandadulthealth.Teenswhohadclosefriendsgrewuptobethehealthieradults.Whetherteensheldbacktheirfeelingsorexpressedthemtoclosefriendsalsoinfluencedlaterhealth.Thosewhoheldbacktheirfeelingsweremorelikelytobesickasadults.Theconnectionheldupevenafterthescientistsaccountedforotherpossibleinfluencesonhealth.Weight，familyincomeanddrugusewereallexamined.Sowerementalhealthissues，suchasanxietyanddepression.Andinthesepeople，suchotherfactorsdidnotexplainadulthealthaswellasteenfriendshipsdid.Gettingalongwiththecrowdmayhavebenefits,saysAllen,buttherearealsodrawbacks.Teenswhoaremoreindependenttendtodobetteratschoolandwork.Andpeerpressuremayleadsomekidstoengageinriskybehavior,suchassmoking,drinkingorusingdrugs.Dealingwithitisanongoingchallenge，Allenacknowledges.“Findingtherightbalanceisthekey.Teensshouldn’tloseheartfornotfinding