论文部分内容阅读
概率问题中的“摸球模型”问题,经常以摸球、抛硬币、掷骰子、转转盘、抽扑克等事件为载体,解题关键要区分是放回实验还是不放回实验,解题的方法是,两步完成的实验适用列表法和树形图法,三步完成的实验适用树形图法.1.有放回式取球第一次取过的球被放回原处,第二次可以重复取到.例1一个布袋内只装有1个红球和2个黄球,这些球除颜色外其余都相同,随机摸出一
Probability problems “touch ball model ” problem, often to touch the ball, throw coins, dice, turn table, poker and other events as the carrier, the key to solving the problem is to put back the experiment or not put back the experiment, The solution to the problem is that the two-step experiment is a list method and a tree method, and the three-step experiment is suitable for the tree method. 1. The ball which has been picked up for the first time is returned to the original The second can be repeated .Example 1 a bag filled with only one red ball and two yellow ball, the ball in addition to the color of the rest are the same, a random out of a