已知，利用傅里叶变换的性质求下列信号的傅里叶变换。（1）；（2）；（3）；http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/e197487a6f0840dbaba98e0d5a1f8891.png

2021-04-14

答案：

http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/fb1ec9264ffe47c7955e39023c4c6abd.png

0
利用拉普拉斯变换性质求<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/fe5d7b22ef544a75ab30050285d239a6.png"/> 的拉氏变换为<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/b09f99c3e3eb4f33a9f187e249b7370e.png"/> （）
1
已知的频谱函数为,利用傅里叶变换性质求下列信号的傅里叶变换。(1)=()(2)=()
2
已知[tex=5.643x1.357]l2G98eTXGaSyC3+DlPx7OVZnmyfXoHYvpzZ0w2WmxXTetajxW1wWLC8vJemP1qHi[/tex], 利用傅里叶变换的性质，求下列信号的傅里叶变换 f(3 t-5)
3
已知，则y(3)=?http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/2d9111b87a35451194499049491e1d44.png
4
设<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/caa2009d65b9414e9eee2f311038ed51.png"/> 为系统输入，<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/af57e24c7bb247e29a81996211b39e9d.png"/>为系统输出，则下列关系式中为线性时不变系统的是（）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/6d8d3ed4bbb5472d8ad95cf86ff40033.png"/> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/553b7fd10b744a38859127a91414813b.png"/> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/e59a6933e2c647d4b5c12b2ebb0a0ff6.png"/> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/4835c010dc244facb01784095e9bd080.png"/>

已知，利用傅里叶变换的性质求下列信号的傅里叶变换。 （1）；（2）；（3）；http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/e197487a6f0840dbaba98e0d5a1f8891.png