2018年秋九年级数学上册第25章概率初步25.2用列举法求概率25.2.2用画树状图法求概率(预习)课件(新版)新人教版.ppt

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2018年秋九年级数学上册第25章概率初步25.2用列举法求概率25.2.2用画树状图法求概率(预习)课件(新版)新人教版.ppt_第1页
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2018年秋九年级数学上册第25章概率初步25.2用列举法求概率25.2.2用画树状图法求概率(预习)课件(新版)新人教版.ppt_第4页
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第二十五章 概率初步,25.2 用列举法求概率,第二十五章 概率初步,第2课时 用画树状图法求概率,第2课时 用画树状图法求概率,探究新知,活动1 知识准备,1从1,2,3这三个数中,随机抽取两个数相乘,积是正数的概率是( ),B,2在“掷一枚骰子”这一事件中,共有_种等可能的结果,其中“点数为偶数”的结果有_种,3,6,第2课时 用画树状图法求概率,活动2 教材导学,1.用列表法求概率,同时掷两个质地均匀的骰子,计算下列事件的概率: (1)两个骰子的点数相同; (2)两个骰子的点数之和是9; (3)至少有一个骰子的点数为2.,第2课时 用画树状图法求概率,(6,6),(1,2),(2,2),(3,2),(4,2),(5,2),(6,2),(1,3),(2,3),(3,3),(4,3),(5,3),(6,3),(1,4),(2,4),(3,4),(4,4),(5,4),(6,4),(1,5),(2,5),(3,5),(4,5),(5,5),(6,5),(1,6),(2,6),(3,6),(4,6),(5,6),第2课时 用画树状图法求概率,2.用树状图法求概率,

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