在义务教育课程标准实验教科书(苏科版)七年级下册中关于概率的定义这样写到:随机事件发生的可能性有大有小.一个事件发生可能性大小的数值,称之为这个事件的概率…,通常规定,必然事件A发生的概率是1,记着P(A)=1;不可能事件A发生的概率为0,记着P(A)=0;随机事件A发生的概率P(A)是0和1之间的一个数.在八年级下册第168页阅读的最后这样写到:这个事件发生的概率是0,但这并不意味 The definition of probability in the Book Seven of the Compulsory Education Curriculum Standard Experiment Textbook (Suke Edition) states: The probability of a random event is very small. The magnitude of an event’s probability of occurrence is called this event , It is generally stipulated that the probability of occurrence A is 1 and P (A) = 1; the probability of occurrence A is 0, P (A) = 0; the probability of occurrence of random event A P (A) is a number between 0 and 1. At the end of the reading of the eighth grade, on page 168 reads: "The probability of this event occurring is 0, but that does not mean