![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[单选题]
拉氏变换原函数f(t)=1(t),则象函数F(s)=( )。
A.1
B.1/S
C.1/S2
D.1/S3
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
B、1/S
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.1
B.1/S
C.1/S2
D.1/S3
B、1/S
试求下列函数的拉氏变换式[设t<0时,f(t)=0]。
设F(ω)=
[f(t)],利用傅氏变换的性质求下列函数的傅氏变换. (1)f(2t); (2)(t-2)f(t); (3)tf’(t); (4)f(1-t); (5)(t-2)f(-2t); (6)e-2jt(t+2).