問答題

試求下列各函數(shù)f1(t)與f2(t)的卷積s(t)=f1(t)*f2(t)
(1)f1(t)=u(t),f2(t)=u(t)
(2)f1(t)=(1+t)[u(t)-u(t-1)],f2(t)=u(t-1)-u(t-2)

 


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