<img alt="" src="https://file.gaojiufeng.cn/learnAppQuestion/22/23/2223cced4cb8880b9896622f7ea06ba9.jpg" style="width: 100%;height: auto;"> B.u(t)=-l(t-1)+2*l(t-2)-l(t-3)V C.u(t)=l(t-1)-l(t-2)V D.u(t)=-l(t+1)+l(t+2)-l(t+3)V

B.u(t)=-l(t-1)+2*l(t-2)-l(t-3)V C.u(t)=l(t-1)-l(t-2)V D.u(t)=-l(t+1)+l(t+2)-l(t+3)V

B.u(t)=-l(t-1)+2*l(t-2)-l(t-3)V C.u(t)=l(t-1)-l(t-2)V D.u(t)=-l(t+1)+l(t+2)-l(t+3)V

A.A
B.B
C.C
D.D

正确答案B

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