※ 引述《howteen (howteen)》之铭言：
: 题目:
: F(S)=1/S^2*(1-e^(-S))^2求拉氏反转换?
F(s) = 1/s^2 - 2exp(-s)/s^2 + exp(-2s)/s^2
= L[ tu(t) ] - L[ 2(t - 1)u(t - 1) ] + L[ (t - 2)u(t - 2)]
=> f(t) = t + (t - 2)u(t - 2) - 2(t - 1)u(t - 1)

感谢大大~