和函数
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sum of equal power series 等幂和
sum function of power series 幂级数的和函数
power sum of series square 级数方幂和
sum of power series
幂级数和
以上为机器翻译结果，长、整句建议使用 人工翻译 。
In this paper a mixed expansion expression for dynamic flexibility of continuous systems is derived. The frist few terms of the expression are a sum of modes, the other terms are power series.
提出一种连续系统动柔度的混合展开表达式，它的前面几项是模态展开，其余各项是幂级数展开。
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