已知系统<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/bf13e16f08d04f6996171a812e1d7f39.png?x-oss-process=image/sharpen,200"/>的响应是<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/852c4dd2388c45bcaa47704c4cf73f94.png?x-oss-process=image/sharpen,200"/>，则其中的零状态响应为