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概率问题一般思维抽象,方法独特,要用到较复杂的排列、组合知识,看似相同,实则不同,容易混淆,稍有疏忽就会致错.因此,在解题时,要善于对比思考,推敲它们之间的区别与联系,并且还要分清有关概念的特定含义.本文就一道概率问题的几种常见错误解法及正确解法进行对比,希望能帮助同学们明辨此类概率问题中的是与非.题目在40个同样的合格品的零件中,混入8个同样的次品,必须一个一个地查出,求正好查完
Probability problems generally thinking abstract, unique method, to use a more complex arrangement, the combination of knowledge, seemingly the same, but in fact different, easy to confuse, a little negligence will lead to wrong.Therefore, in solving problems, we should be good at thinking, To consider the difference and connection between them, and also to distinguish the specific meaning of the concept.This paper compares several common mistakes and correct solutions of a probability problem, hoping to help students to identify such probability problems The problem with the same 40 qualified parts, mixed with 8 of the same defective, you must find out one by one, just check finished