小白求教MATLAB问题啊答:k=300;num=[0.0518,-0.1553,0.1553,0.0518];den=[1,1.2828,1.0388,0.3418];w=0:pi/k:pi;h=freqz(num,den,w);subplot(2,2,1);plot(w/pi,real(h));grid title('实部')xlabel('\omega/\pi');ylabel('幅度');subplot(2,2,2);plot(w/pi,imag(h));grid title('虚部')...