五年级上册_掷一掷(正式).ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,掷 一 掷,松滋市黄杰小学 李明,仔细观察，你有什么发现,?,5,2,6,shi,色 子,3,4,1,猜一猜,：,同时掷两个骰子,点数和可能是几,?,可能是,2,3,4,5,6,7,8,9,10,11,12,。,猜一猜：,不可能是几,?,不可能是,1,，也不可能是大于,12,的数,.,A,组：,5,、,6,、,7,、,8,、,9,B,组：,2,、,3,、,4,、,10,、,11,、,12,猜一猜：哪组赢的可能性大？,活动要求,：,四人一组，分工协作，掷色子。和是几，就在几的上面涂一格。掷二十次，游戏结束。,0,4,6,2,3,4,5,6,7,9,8,10,11,12,8,10,2,实验,1000,次“两个色子的和”出现情况统计图,2 3 4 5 6 7 8 9 10 11 12,5,10,15,20,25,30,35,40,45,50,60,65,55,70,75,80,85,90,95,100,105,115,120,110,次数,125,瑞士数学家,雅各布,-,伯努利,1654-1705,。他建立了概率论中的第一个极限定理，我们称为“,伯努利,大数定理,”，即“在多次重复试验中，频率有越趋稳定的趋势”。这一定理即,1713,年，发表在他的著作,猜度术,中。,合作探究二：,哪些和出现的可能性大？哪些和出现的可能性小？,+,1,2,3,4,5,6,1,2,3,4,5,6,2,3,4,7,5,6,3,4,5,6,7,8,4,5,5,6,6,6,7,7,7,7,8,8,8,8,9,9,9,9,10,10,10,11,11,12,1,1+1,1+2,1+3,1+4,1+5,1+6,2+6,3+6,4+6,5+6,6+6,2+1,2+2,2+3,2+4,2+5,3+5,4+5,5+5,6+5,3+1,3+2,3+3,3+4,4+4,5+4,6+4,4+1,4+2,4+3,5+3,6+3,5+1,5+2,6+2,6+1,2,3,4,5,6,7,8,9,10,11,12,和,2,3,4,5,6,7,3,4,5,6,7,8,4,5,6,7,8,9,5,6,7,8,9,10,6,7,8,9,10,11,7,8,9,10,11,12,1,2,3,4,5,6,2,1,2,3,4,5,6,3,1,2,3,4,5,6,4,1,2,3,4,5,6,5,1,2,3,4,5,6,6,1,2,3,4,5,6,6,1,5,1,5,2,6,2,4,1,4,2,4,3,5,3,6,3,3,1,3,2,3,3,3,4,4,4,5,4,6,4,2,1,2,2,2,3,2,4,2,5,3,5,4,5,5,5,6,5,1,1,1,2,1,3,1,4,1,5,1,6,2,6,3,6,4,6,5,6,6,6,2,3,4,5,6,7,8,9,10,11,12,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,7,6,5,4,3,2,1,0,1,3,2,4,5,6,5,4,3,2,1,+=36,种,24,-,12,=12,种,(,种,),1,3,2,4,5,6,5,4,3,2,1,24,12,36,(,种,),实验,1000,次“两个色子的和”出现情况统计图,2 3 4 5 6 7 8 9 10 11 12,5,10,15,20,25,30,35,40,45,50,60,65,55,70,75,80,85,90,95,100,105,115,120,110,次数,125,0,(,种,),24,12,36,实验,1000,次“两个色子的和”出现情况统计图,2 3 4 5 6 7 8 9 10 11 12,5,10,15,20,25,30,35,40,45,50,60,65,55,70,75,80,85,90,95,100,105,115,120,110,次数,125,0,(,种,),北山超市举办店庆活动：,顾客掷两颗骰子，根据两颗骰子的点数和决定奖品金额。,下面是超市销售经理所设计的两种促销方案,：,总点数,2,3,4,5,6,7,8,9,10,11,12,金额,/,元,20,40,60,80,100,120,100,80,60,40,20,方案,A,：,方案,B,：,总点数,2,3,4,5,6,7,8,9,10,11,12,金额,/,元,120,100,80,60,40,20,40,60,80,100,120,1.,如果你是超市总经理，你会采取哪种方案？为什么？,2.,如果你是顾客，你希望超市选择哪种方案？,总点数,2,3,4,5,6,7,8,9,10,11,12,金额,/,元,20,40,60,80,100,120,100,80,60,40,20,方案,A,：,方案,B,：,总点数,2,3,4,5,6,7,8,9,10,11,12,金额,/,元,120,100,80,60,40,20,40,60,80,100,120,课外小知识,【,骰,】,，念,tu,，俗称“色（,shi,）子”指的是骨制的赌具，正方形，用手抛，看落下后最上面的点数。,掷骰子,标准应该念作：,zh,tu,zi,。但生活中习惯念作：,zh,shi,zi,。指的是：在棋牌或游戏中掷出骰子的步骤和动作。,