必修五11《Unit1GreatScientist》 (2).ppt

新课标人教版课件系列高中英语必修必修5-5-1.1 Reading Task (P45)Finding The Solution Puzzle ABCAABBCCDDECan you go over it without missing any points or going over a line twice?FABCAABBCCDDEstartfinishFABCAABBCCDDEEuler said,“If a figure has more than two odd points,you cannot go over it without lifting your pencil from the page or going over a line twice.”A.B.C:even pointsA.B:even pointsC.D:odd pointsC.D.E.F:odd pointsA.B:even pointsFLeonhard Euler (1707-1783)Born:15 April 1707 in Basel,SwitzerlandDied:18 Sept 1783 in St Petersburg,RussiaEuler was a famous mathematician in the eighteenth century,he introduced a new branch of mathematics called topology.It is a form of geometry that help you understand things by turning them into diagrams.Reading P45What is Euler path?curved linestraight lineeven pointodd pointA,B,C D:odd pointsA,C:odd pointsB,D:even pointsNo Euler pathHas Euler pathstartfinishFig 4:A 1 2 3 4Figure 4