三年级数学下册第8章数学广角—搭配第2课时搭配课件新人教版.ppt

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1、变换他们的位置,可以照出几张不同的照片?,可以照这么多呀!,一共有多少种穿法?,每次上装和下装只能各穿1件。,短袖,长袖,短裙,长裤,长裙,衣服搭配,请同学们小组一起,一位同学摆一摆,其他同学数一数一共能摆出多少种不同的搭配方法,然后互相说说你是怎么摆的。,思考:在摆的过程中怎样才能做到不重复、不遗漏呢?,上、下装搭配的每种穿法需要两步来确定,一步是上装的选择,一步是下装的选择。,一共有多少种穿法?,我先选定上装,再搭配不同的下装。,一共有多少种穿法?,一共有6种穿法。,3, 2,= 6(种),连线法,一共有多少种穿法?,一共有6种穿法。,我先选定下装,再搭配不同的上装。,2, 3,= 6(种

2、连线法,我用 表示上装, 表示下装。,图形表示法,一共有6种穿法。,每件上装可以与3件下装搭配,这样就有3种穿法,图形表示法,一共有6种穿法。,A1 A2,B1 B2 B3,每条连线表示1种穿法。,我用A表示上装,B表示下装。,字母表示法,6种,连线法,字母表示法,图形表示法,搭配要( ),才能不重复、不遗漏。,有序,1.选好了衣服,要吃早餐了,看看都有哪些好吃的?,为了营养均衡,饮料和点心只能各选一种进行搭配,请找找一共有多少种不同的搭配吧!,1. 下面的早餐有( )种不同的搭配。,8,饮料和点心只能各选1种。,2种饮料,4种点心,248(种),“草原之行”路线图,呼和浩特,包头,大草原

3、同学们,从呼和浩特经过包头到大草原有几种路线?分别是哪几种?,1号线,2号线,A号线,B号线,C号线,呼和浩特,包头,大草原,1号线,A号线,“草原之行”路线图,呼和浩特,包头,大草原,1号线,B号线,“草原之行”路线图,呼和浩特,包头,大草原,1号线,C号线,“草原之行”路线图,呼和浩特,包头,大草原,2号线,C号线,“草原之行”路线图,呼和浩特,包头,大草原,2号线,B号线,“草原之行”路线图,包头,大草原,呼和浩特,2号线,A号线,“草原之行”路线图,流连忘返,蒙古之行,蒙古之旅,大开眼界,蒙古一游,一饱眼福,请你说一说,这节课你有什么收获?,课本第104页练习二十二第1,3,6题。,xx小学 x年级x班,xxx,

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