在人教社出版的旧教材中《,概率》一章只学习了等可能事件求概率的“古典概率类型”问题。但新教材已经延伸到“几何概率类型”问题:P(A)=构成事件A的区域长度(面积或体积)/全部结果构成的区域长度(面积或体积)。从定义可以看出,概率问题与几何产生了紧密的联系,随而概率也就和函数,方程,不等式,曲线等产生了交汇处,进一步体现了数形结合的美妙思想。下面,用实例就几何概率中“长度”和 The “Probability” chapter in the old textbooks published by Popes Society only learned about the “classical probability type” problem of probabilistic events. However, the new textbook has been extended to the question of “Geometrical Probability Types”: P (A) = length (area or volume) of the area that constitutes event A / area length (area or volume) of the overall result. It can be seen from the definition that the problem of probability is closely related to the geometry, and the probabilities also converge with functions, equations, inequalities, curves and so on, which further embodies the wonderful idea of ​​the combination of numbers and shapes. In the following, use the example geometry probability “length ” and