*计第*/2=∫f()1(-)dr fi(t) ● f2(t) b t-20t1 解:1.-∞0≤t≤0 2 t-2 重合面积为零:;f(t)*f(t)=0 t-2 2..0≤t≤1 0 f*2=f()2(t-D)dz ■解:1. −  t  0 重合面积为零:f1(t)*f2(t)=0 2...if ..0  t  1 a 0 t-2 1 f f f ( ) f (t  )d 1  2 = 1 2 −   − * 0 a 1 f1(t) t f f f ( ) f (t  )d  1  2 = 1 2 −   − 计 算 f2(t) t 0 2 b a t-2 0 t 1 t-2 0 1 t 0 t-2 1 t 