双边拉氏变换收敛域一f()=()+el(-t) ∫/Ob0cd+上() O<1 eut (t) O>0 LT f(t) 0 S J >0 0 <1 0k<116 双边拉氏变换收敛域— f (t) u(t) e u( t) t 0 (1 ) 0 f (t)e dt u(t)e dt u( t)e dt t t t 0 1 s s f t LT 1 1 1 ( ) 0 1 0 1 j eu( t) t u(t) 0 1 0 1 0 1 0