GA=feedback(G123,G5); % G5 phan hoi am G123Gh=GA*G4; % GA noi tiep G4Gk=feedback(Gh,G6)ltiview({'step','impulse'},Gk)ltiview({'nyquist','bode'},Gh)% Khai bao ham truyen cac khauSTT=7;G1=tf([10],[1 1]);G2=tf([STT],[1 2]);G3=tf([10],[1 3]);G4=tf([4],[1 1]);G5=10;G6=tf([3],[1 1]);% Xac dinh ham truyen[r]