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t 的拉普拉斯变换:证明 L{t}(s) = integrate from 0 to infinity of t e^(-st) dt = 1/s^2 ,其中 。
t 的拉普拉斯变换:证明 L{t}(s) = integrate from 0 to infinity of t e^(-st) dt = 1/s^2 ,其中 。
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