逐项微分
A differential equation with constant coefficient is obtained by Termwise differentiation on the sum function of power series in this method, and the sum of constant series is able to be solved from the general solution of differential equation.
该方法运用逐项微分法将幂级数的收敛和函数转化为相应的常系数线性微分方程,求出微分方程的通解从而得到相应常数项级数之和。
To Get the Digital Expectation and Variance of Random Variance by the Method of Termwise Differentiation
用逐项微分法求随机变量的数学期望与方差
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