解: x(k)=DFTLx(n)]=>@wk=>(ae-iN) =0 0 0≤k≤7 ae jTk 因此得 X(0)=416114 X(4)=0.46235 X(1)=0.710630.92558×5)=0.47017+10.16987 X(2)=0.507460.40597×(6)=050746+j0.40597 X(3)=0470170.16987×(7)=0.710631092558 Maab实现f1m解： 因此得 X(0)=4.16114 X(1)=0.71063-j0.92558 X(2)=0.50746-j0.40597 X(3)=0.47017-j0.16987 X(4)=0.46235 X(5)= 0.47017+j0.16987 X(6)= 0.50746+j0.40597 X(7)= 0.71063+j0.92558 Matlab实现 fft1.m