2.17 求下列函数的卷积积分 _(1)(t)*(f)_(2)(t) o-|||-(1) _(1)(t)=tg(t) ,_(2)(t)=e(t)-|||-(2) _(1)(t)=(e)^-2tg(t) ,_(2)(t)=g(t)-|||-(3) _(1)(t)=(f)_(2)(t)=(e)^-2tg(t)-|||-(4) _(1)(t)=(e)^-2tg(t) _(2)(t)=(e)^-3tg(t)-|||-(5) _(1)(t)=tg(t) ,_(2)(t)=(e)^-2te(t)-|||-(6) _(1)(t)=g(t+2) ,_(2)(t)=g(t-3)-|||-(7) _(1)(t)=g(t)-g(t-4) ,_(2)(t)=sin (pi t)g(t)-|||-(8) _(1)(t)=tg(t) ,_(2)(t)=g(t)-g(t-2)-|||-(9) _(1)(t)=tg(t-1) ,_(2)(t)=g(t+3)-|||-(10) _(1)(t)=(e)^-2tg(t+1) ,_(2)(t)=g(t-3)

2.17 求 下列函数的卷积积分 _(1)(t)*(f)_(2)(t) o-|||-(1) _(1)(t)=tg(t) _(2)(t)=g(t)-|||-(2)

2.17 求下列函数的卷积积分 _(1)(t)*(f)_(2)(t)-|||-(1) _(1)(t)=tg(t) _(2)(t)=g(t)-|||-(2) _(

2-13 求下列各函数f1 (t)与f2(t )的卷积 _(1)(t)*(f)_(2)(t)-|||-(1) _(1)(t)=u(t), _(2)(t)=(e)

4.18 求下列信号的傅里叶变换。-|||-(1) (t)=(e)^-tg(t-2)-|||-(2) (t)=(e)^-3(t-1)g(t-1)-|||-(3)

2-2 求下列函数的拉普拉斯变换,假定当 lt 0 时, (t)=0-|||-1) (t)=5(1-cos 3t)-|||-2) (t)=(1+t+(t)^2)

4.20若已知 (t)arrow F(jomega ) ,试求下列函数的频谱。-|||-(1)tf(2t)-|||-(2) (t-2)f(t)-|||-(3)

1.求下列函数的Fourier积分表达式：(1)f(t)=}1-t^2,&|t|<1,0,&|t|geq1.1.求下列函数的Fourier积分表

在曲线=(t)_(2), =-(t)^2, =3(t)^2+1上的点=(t)_(2), =-(t)^2, =3(t)^2+1处的切向量（）A =(t)_(2),

[单选题]已知T（1）=9，T（2）=8，T（0）=5，Total=T（1）+T（2）+T（0），则Total=（）。A . 9B . 22C . 8D . 5

9.4 利用拉氏变换的性质,计算 8[f(t)]:-|||-(1) (t)=t(e)^-3tsin 2t;-|||-(2) (t)=t(int )_(0)^t(