异分母分式的加减法

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1、MathematicsTeachingplan1.TeachingPlanInformation教案信息Grade/Level年级/水平:Grade8Teacher任课教师:张艳玲Topic主题:Addingandsubtractingalgebraicfraction分式的加减法Period课时:第2课时ThesecondclassStatementofInquiry探究陈述:发现数学关系有助于更好地理解代数计算系统是怎样演变的。Workingonmathematicalrelationshiphelpsunderstandthechangesof

2、thealgebracalculationsystemInquiryquestion探究问题:如何进行异分母分式的加减Howtoaddandsubtractalgebraicfractionswithdifferentdenominator?Globalcontexts全球背景:身份认同与关系IdentitiesandRelationshipsKeyconcepts重大概念:关系relationshipRelatedconcepts相关概念：变化,等值change,equivalence2.Teachingobjectives教学目标1.掌握找分式的

3、最简公分母的方法。StudentscouldfindtheLCMofdenominatorwithskill2.掌握异分母分式的加法和减法，正确写计算结果。Studentscouldaddandsubtractalgebraicfractionswithdifferentdenominatorefficientlyandshowfinalanswercorrectly.3.Teachingprocedures教学过程Addingandsubtractingalgebraicfraction分式的加减法(2)LearningResources学习资源V

4、ocabularynumericalfraction分数algebraicfraction分式numerator分子denominator分母rationalexpression有理式reductionofafraction约分integralexpression整式simplestfraction最简分式commonfactor公因式theLCM(lowestcommonmultiple)ofdenominator最简公分母Leadin:Calculate:Wehavelearnt:wewilllearn:异分母分式如何进行加法或者减法？Howto

5、addorsubtractalgebraicfractionswithdifferentdenominator?_____________________________________________________________________________________InquiryⅠ:Convertfractionstothesamedenominator.通分A分母是单项式Thedenominatorismonomial(1)（2）,,HowtofindtheLCMofdenominator______________________

6、_________________________B分母是二项式Thedenominatorisbinomial(1)(2)(3)HowtofindtheLCMofdenominator__________________________________________________C分母是多项式Thedenominatorispolynomial（1）(2)HowtofindtheLCMofdenominator______________________________________________________InquiryⅡ：Calcu

7、late:addingandsubtractingalgebraicfraction分式的加减运算A分母是单项式Thedenominatorismonomial（1）Tips:________________________________________________________________________________B分母是二项式ThedenominatorisbinomialTips:__________________________________________________________________________

8、______C分母是多项式Thedenominatorispolynomial（1）（2）Tips:____