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S = sum[1...N/2-1]x(k)*exp(-j*2*pi/N*k) + x(N/2)+sum[N/2+1..N]x(k)*exp(-j*2*pi/N*k)
У нас x(k) = x(k+N/2) k=1..N/2 обозначаем первое слагаемое S1:
S = S1+x(N/2)+S1*exp(-j*pi)
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