最新16.3二次根式的加减乘除混合运算课件PPT.ppt 23页

'16.3二次根式的加减乘除混合运算 1、单项式与多项式、多项式与多项式的乘法法则法则分别是什么?2、多项式除以单项式的除法法则是什么?m(a+b+c)=ma+mb+mc；(m+n)(a+b)=ma+mb+na+nb(ma+mb+mc)÷m=a+b+c温故而知新 分配律单×多转化前面两个问题的思路是：思考：若把字母a,b,c,m都用二次根式来代替(每个同学任选一组)，然后对比归纳，你们发现了什么？单×单 （1）整式乘法运算中的乘法公式有哪些?平方差公式：(a+b)(a-b)=a2-b2;完全平方公式：(a+b)2=a2+2ab+b2;(a-b)2=a2-2ab+b2.2、利用乘法公式进行二次根式的运算（2）整式的乘法公式对于二次根式的运算同样适用。 例2计算：解：归纳进行二次根式的混合运算时，一般先将二次根式转化为最简二次根式，再根据题目的特点确定合适的运算方法，同时要灵活运用乘法公式，因式分解等来简化运算. 闯关一、基础闯关相信你能过关！2、比一比，看谁算得又快又准！ 1、已知试求x2+2xy+y2的值.解：x2+2xy+y2=（x+y)2把代入上式得原式=闯关二、能力提升闯关你过关了吗？2、已知的整数部分是a,小数部分是b,求a2-b2的值.解： 3、阅读下列材料，然后回答问题：在进行类似于二次根式的运算时，通常有如下方法将其进一步化简：运用以上规律化简： 课堂小结二次根式混合运算乘法公式化简求值分母有理化化简已知条件和所求代数式(a+b)(a-b)=a2-b2(a+b)2=a2+2ab+b2(a-b)2=a2-2ab+b2(x+a)(x+b)=x2+(a+b)x+ab Givethestresstothefollowingmedicaltermsandreadthemaloud:asymptomatic,anemia,amorphous,angioplasty,angitis,antibiotic,hereditary,deoxyribonucleicacid,electroencephalogram,endemic,angiogram,myelogram,electrocardiograph,chronograph,spirograph,ultrasonography,hepatogastric,mammography,sclerosis,tuberculosis,psychosis,phagocytosis,osteoplasty,spirometer,stethoscope,stethalgia,chemotherapy,urinoglucosometer,genitourinary Humandiseases Howtodefinepathology?Whataretheclassificationsofdiseases?Howgermsenterthehumanbody?Howdoesahumanbodyfightagainstdisease?DescribethefunctionofantibodiesHowtoexplainthetheoryofvaccination? Whenthesamediseasestrikesaregionordistrictyearafteryear,wecallit____.Disabilityandillnesscanbeprovokednotonlybyinfectiousandnoninfectiousdiseases,butalsobypsychologicalandsocialfactors.Atypicalexampleisdrug___.Alllivingthings,animalorplant,can____diseases,butagoodhealthcaresystemdoes____therateofdisease.Normallyahealthyperson’sdefensesystemcan____infection,buttheoldandweakareespeciallyvulnerabletodiseases.Marriageamongrelativesmayresultin____._____,suchasheartattack,ususllyhasasuddenandviolentonset,butitcanbecuredinafewdaysiftreatedtimely. 7.Persons____AIDSareoftenthosewhoaredrugaddictsorthosewhohavesexualcontactwiththosewhoareHIVcarriers.8.Many____invadersofthebodycannotbearbodytemperatureanthosewhosurviveandthrivewillbedestroyedwhenthebody___higher,fevertemperature.9.Whenalargenumberofcasesofthesamecommunicablediseaseoccursduringasingleperiodoftime,itistermedas____. sign1.Cholera,hepatitis,typhoidfeverFirstlineofdefense2.Germs,virusorfungiSecondlineofdefense3.carrierAbscess4.HighfeverPathogen5.TheskinandmucousmembraneAntigen6.alzheimer’sdiseaseChronicdisease7.HighbodytemperatureSymptom8.AresultofchangeingenepatternsVector9.ErraticcellgrowthInfectiousdisease10.Substancewhichcausesformationinthebloodofanothersubstance,antibodynonInfectiousdisease11.ThebloodandlymphBirthdefect12.Aswellingfilledwithpusinoronthebody 损害正常功能污染环境功能失调致病因子易受侵害的人群局部化的感染花柳病抗原与抗体 DiagnosisandPrognosis Whatisdiagnosis?Whatshouldbeincludedasthemajorcontentinamedicalhistory?Whatshouldbeincludedinageneralphysicalexamination?Givebriefaccountsofeachlabtests.Whyidthehandlingofprognosisimportantbothfordoctorsandpatients? 肌电图多发性硬化心电图疾病的后遗症光纤技术造血系统致命的疾病体液无副作用的治疗无创检查核磁共振葡萄糖耐量实验乐观的预后超声波检查病史随访营养不良使细节显著脑电图缺血的组织 ApproachtothepatientWhatarethedoctor’sdutieswhenapatientisseekinghelpfromadoctor?Whataretheproperattitudeadoctorshouldassumeincopingwiththe“FiveD’s”ofapatient?Whatshouldadoctorbearinmindinthetreatmentofapatient?Explainthesentence“Thephysicianshouldactasthepatient’sadvocate”.Inordertohelpthepatientwithmedicinecompliance,whatrulesshoulddoctorstofollow?Whatshouldadoctordointermsofpreventiveandhealthmaintenanceactivities?'