在解决有关复杂的离散型随机变量的分布列,或期望、方差的问题时,学生往往由于被求解的结论与条件之间的关系隐含,理不清思路,常常不知如何下手,或导致许多错误·实际上,通过引入随机变量函数的方式,可有效解决这一困难,且使解题思路顺畅·主要途径如下·一、建立随机变量函数 When solving problems concerning the distribution of complex discrete random variables, or the problem of expectation and variance, students tend to be implicit due to the relationship between the conclusions and the conditions being solved. They do not understand ideas and often do not know how to start or cause many problems. Errors • Actually, by introducing a random variable function, we can effectively solve this difficulty and make the problem-solving ideas smooth. The main approaches are as follows: 1. Establish a random variable function