然后将第三章的两个模型分别推广到带常利率情形，利用模型转换和拉普拉斯变换得到了生存概率满足的关系式。
Then we obtained the equations of the survival probability of two risk models with constant interest which have studied in chapter three by means of Laplace transform and change of the model.
用拉普拉斯变换式对微分方程进行变换，把输出和输入联系起来，得到脉冲响应与系统输入输出之间的对等关系。
Laplace transform is used to combine output and input, then the impulse response and equivalent operations of system input and output are gained.
用拉普拉斯变换式对微分方程进行变换，把输出和输入联系起来，得到脉冲响应与系统输入输出之间的对等关系。
Laplace transform is used to combine output and input, then the impulse response and equivalent operations of system input and output are gained.
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