已知`f_1(t)=e^-tu(t),f_2(t)=sin(t)u(t)`,且`f(t)=f_1(t)*f_2(t)`,则`f(0)=`?
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举一反三
- 已知`f_1`(t)=u(t),`f_2`(`t`)=`e^-t``u(t)`,且`f(t)`=`f_1(t)*f_2(t)`,则`f(0)`=? <br/>______
- 已知`f_1(t)=(1+t)[u(t)-u(t-1)],f_2(t)=u(t-1)-u(t-2),且f(t)=f_1(t)*f_2(t),则f(1.5) = ?`(保留小数点后三位 <br/>______
- 【多选题】若f 1 (t) = ɛ (-t) , f 2 (t) = e t ,则f 1 (t)* f 2 (t) = A. f 1 ꞌ (t)* f 2 (–1) (t) B. f 1 (–1) (t)* f 2 ꞌ (t) C. f 1 (t-3)* f 2 (t+3) D. f 1 (–3) (t)* f 2 ꞌꞌꞌ (t)
- 已知f(t)=u(t-1)-u(t-2),且s(t)=f(t)*f(t),则s(3)=? <br/>______
- 设f(1)=0,t<3,试确定信号f(1-1)+f(2-t)为0的t值 A: t>-2或t>-1 B: t=1或t=2 C: t>-1 D: t>-2