新课标人教版课件系列《高中英语》必修5-1.1ReadingTask(P45)FindingTheSolutionPuzzleABCAABBCCDDECanyougooveritwithoutmissinganypointsorgoingoveralinetwice?FABCAABBCCDDEstartfinishFABCAABBCCDDEEulersaid,“Ifafigurehasmorethantwooddpoints,youcannotgooveritwithoutliftingyourpencilfromthepageorgoingoveralinetwice.”A.B.C:evenpointsA.B:evenpointsC.D:oddpointsC.D.E.F:oddpointsA.B:evenpointsFLeonhardEuler(1707-1783)Born:15April1707inBasel,SwitzerlandDied:18Sept1783inStPetersburg,RussiaEulerwasafamousmathematicianintheeighteenthcentury,heintroducedanewbranchofmathematicscalledtopology.Itisaformofgeometrythathelpyouunderstandthingsbyturningthemintodiagrams.ReadingP45WhatisEulerpath?curvedlinestraightlineevenpointoddpointA,B,CD:oddpointsA,C:oddpointsB,D:evenpointsNoEulerpathHasEulerpathstartfinishFig4:A1234Figure4
