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1本单元重、难点分析 1)重点:等可能性事件的概率,互斥事件有一个发生的概率,相互独立事件同时发生的概率,独立重复试验.①等可能性事件的概率的关键是正确计数,即事件A包含的基本事件个数m和试验结果总数n,具备娴熟地解排列组合应用题的能力是处理好此类问题的必要条件.②弄清“互斥事件”、“对立事件”、“相互独立事件”之间的区别与联系,掌握公式P(A+B)=P(A)+P(B),P(A)=1-P(A),P(A·B)=P(A)·P(B),以及由它们派生出的常用公式的适用范围.理解“至少”、“至多”、“都”、“或”等词汇的意义,理解“独立重复试验”等概念,是学好本单元内容的基础.在学习中,要勤比较、多思考,注意举一反三,触类旁通.
1 The unit’s heavy and difficult analysis 1) Key points: The probability of such probability events, the probability of mutual exclusion events having one occurrence, and the probability of mutual independent events occurring at the same time, the key to the probability of independently repeating tests .1 and other possible events is correct. Counting, that is, the number of basic events m and the total number of test results included in event A, is the necessary condition to deal well with such problems by having the ability to unravel the combinatorial application questions. 2 Find out “mutually exclusive events” and “opposing events”. Differences and relations between “and independent events”, master the formula P(A+B)=P(A)+P(B), P(A)=1-P(A), P(A·B )=P(A)·P(B), and the scope of application of the commonly used formulas derived from them. Understand the meaning of terms such as “at least”, “at most”, “all”, and “or”, and understand “independent repetition tests”. ” Concepts are the basis for learning the content of this unit. In the course of study, we must be diligent and considerate, pay attention to inferences, and pass by analogy.