必修五 1.1《Unit 1 Great Scientist》

新课标人教版课件系列,高中英语 必修5-1.1,The 8th Period Listening & reading (P44-P45),Listening Task (P44),Listening Task P44,Reading Task ( P45 ) Finding The Solution,Puzzle,A,B,C,A,A,B,B,C,C,D,D,E,Can you go over it without missing any points or going over a line twice?,F,A,B,C,A,A,B,B,C,C,D,D,E,start,finish,F,A,B,C,A,A,B,B,C,C,D,D,E,Euler 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 points,A.B:even points C.D: odd points,C. D.E.F: odd points A.B: even points,F,Leonhard Euler (1707-1783) Born: 15 April 1707 in Basel, Switzerland Died: 18 Sept 1783 in St Petersburg, Russia,Euler 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 P45 What is Euler path?,curved line,straight line,even point,odd point,A,B,C D : odd points,A, C: odd points B, D:even points,No Euler path,Has Euler path,start,finish,Fig 4:,A,1,2,3,4,Figure 4,