• 求f(t)的初值和终值!

    极点在复平面左侧s=-3根据初值和终值定理,f(0+)=lim(s->+∞)s*f(s)=lims*(2s+1)/(s+3)^2=2f(+∞)=lim(s->0)s*f(s)=0

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