由于概率的产生、建立和发展与生活实际密切相连 ,而生活中的问题 ,其条件和背景千差万别 ,一般没有固定的法则和套路 .由于种种原因 ,我们常常会把概率问题仅看做一个传统的确定性数学问题 ,在教学中把概率的公式和法则当作重点 ,甚至有的教师试图为学生提供一个现成的模式或 Since the generation, establishment, and development of probabilities are closely linked to the reality of life, the conditions and backgrounds of life vary from one condition to another, and there are generally no fixed rules and routines. For various reasons, we often regard probability problems as only a traditional one. In deterministic mathematics, the probability formulas and rules are taken as the focus in teaching, and some teachers even try to provide students with a ready-made model or