一类概率计算题型的新解法

A new solution to a kind of calculating probability problem

概率的计算是高校期末考试、研究生入学考试等一系列重要考试的必考题型,不少学生对概率计算学习较困难,考试得分较低.在重新描述概率定义的基础之上,利用数形结合的方法巧解一类计算概率的题型,该方法简单直观,对初学者容易掌握,从而达到提高学生学习成绩和教学质量的目的.

The calculation of probability is a necessary test type for a series of important examinations,such as the final examination of universities,graduate entrance examination,etc.Many students have difficulty in probability calculation,and the whole of them get very low score in the exam.On the basis of redefining the definition of probability,the method of combination of number and form was usd to solve a kind of questions of calculating probability.This method is simple and intuitive,easy for beginners to master,so as to improve students′learning achievement and teaching quality.