概率内容的概念较多,而且容易混淆,本文就学生易犯错误归纳如下:类型1“非等可能”与“等可能”混同.例1掷两枚骰子,求所得的点数之和为6的概率.错解掷两枚骰子出现的点数之和有2,3,4,…,12,计11种情形,即有11种基本事件,所以概率为P=111.剖析以上11种事件不是等可能的,如点数 There are many concepts of probabilistic content, and it is easy to confuse. This article summarizes the students’ susceptibility to mistakes as follows: Type 1 “non-equal possibilities” and “equal possibilities” are mixed. Example 1 Two dices are thrown, and the sum of the number of points obtained is 6 Probability. Mistakes The sum of the number of points thrown by two dice is 2,3,4,...,12, counting 11 kinds of situations, that is 11 kinds of basic events, so the probability is P=111. The above 11 kinds of events are not equal. Possible, such as points