英语翻译离散型随机变量数学期望的求法摘要：本文举出离散型随机变量数学期望的几种求法,包括定义法,分解法,利用对称性,套用

Abstract:This article cited Discrete Random Variable Expectation law,including the definition of method,decomposition method,using symmetry,the formula has been applied,using recursion,generating function method,as well as in the real world use.
Keywords:discrete random variables; distribution of the column; mathematical expectation

Discrete random mathematical expectation is introduced
Abstract: in this article use discrete random mathematical expectation, including the definition of several solution method, using the method...

Discrete random mathematical expectation is introduced..
Abstract: in this article use discrete random mathematical expectation, including the definition of several solution method, using the meth...

Abstract:
in this article use discrete random mathematical expectation, including the definition of several solution method, using the method of decomposition, symmetry, applying existing formula...