短語詞組短語integrating effect factor 積分因子integrating U factor 積分因子Integrating E factor 積分因子Method of Integrating Factor 積分因子法complex integrating factor 複郃型積分因子的multiplier integrating factor 乘積型積分因子formal integrating factor 形式積分因子integrating factor method 積分因子法variate separated type integrating factor 變量分離型積分因子 返回 integrating factor