求幂级数收敛域最关键的是求它的收敛半径。
To find the solution of power series convergence domain, it is important to get its radius of convergence.
为了克服级数收敛缓慢的缺点，提出级数求和公式。
In order to overcome the demerit of the slowness of the series convergence, we put forward the series summation formula.
在规定的范围内该无穷级数收敛，并有计算公式成立。
Within the restricted scope, the infinite power series is convergent and the formula is workable.
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