[九年级数学教案]数学教案-用公式解一元二次方程121用公式解（[ninthgrademathemati

《[九年级数学教案]数学教案-用公式解一元二次方程121用公式解（[ninthgrademathemati》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

1、［九年级数学教案］数学教案-用公式解一元二次方程12.1用公式解([ninthgrademathematicsteachingcase]mathematicalteachingcase一solvingaquadraticequationwithaformulabyformula12.1)Mathematicsteachingwithformulasforsolvingthequadraticequationwithoneunknown12.1formulasforsolvingthequadraticequationwithoneunknown(a)DVNEWS_AD

2、_BEG1N—>DVNEWS_AD_END—>12.1solutionsofquadraticequationwithoneunknownformula(a)thetargetofqualityeducation,knowledgeteaching:(a)1.toenablestudentstounderstandthequadraticequationwithoneunknownandintegralequation;generalform2.graspthequadraticequationwithoneunknown,correctidcntificationo

3、ftwoquadraticcoefficients,acoefficientandtheconstantterm.(two)theabilityoftraining:1.byintroducingaquadraticequationwithoneunknown,thecultivationofstudcnts，abilitytoanalyzeandsolveproblems;2.byquadraticequationwithoneunknownconceptlearning,trainingandthedepthofstudentstounderstandthecon

4、ceptofmoralcducation.(three):fromknowlcdgccomesfrompractice,establishthethoughtoftransformation,byaseriesofunknownequationofinfiltrationtothestudentsthinkingmethodequation,Thecultivationofmathematicsconsciousnessforstudents.Tntwo,theemphasesanddifficultiesofteaching1.teachingpoints:teac

5、hingdifficultyofquadraticequationwithoneunknownsignificanceandthegeneralformof.2.:correctrecognitioninthegeneral"item"and"coefficient〃・Three,teachingsteps(a)1.cleargoalswithacomputerdemonstrationofthefollowingoperations:thinarectangularpieceofsheetsteel,inthefouranglesteelsheetcutfourof

6、thesamesmallsquare,thenthefourfold,becomesacapofrectangularbox,thepresentationiscompleted,studentstookoutapreparedrectangularpiecesofpaperandscissors,theactualoperationprocessofwhatjustdemonstrates・Theactualoperationofthestudents,whichlaysthefoundationforsolvingtheproblems,andcultivates

7、tudents'hands,brain,eyeandtheabilityof.2.toanexistingpieceof80cmlong,thinsteelsheetwidth60cm,cutofffourateachcornerThesamesmallsquare,andthenabottomareaof1500citi2isnocovercuboidbox,itshouldbehowtofindthemissingsmallsidelengthofthesquare?Teachersinspirestudentswithunknown,equat