3.6 求下列差分方程所描述的LTI离散系统的零输入响应零状态响应和全响应。-|||-(1) (k)-2y(k-1)=f(k),-|||-(k)=2g(k),y(-1)=-1-|||-(2) y(k)+2y(k-1)=f(k) ,-|||-(k)=(2)^kg(k),y(-1)=1-|||-(3) (k)+2y(k-1)=f(k),-|||-(k)=(3k+4)g(k),y(-1)=-1-|||-(4) y(k)+3y(k-1)+2y(k-2)=f(k) ,-|||-(k)=g(k),y(-1)=1,y(-2)=0-|||-(5) y(k)+2y(k-1)+y(k-2)=f(k) ,-|||-(k)=3((dfrac {1)(2))}^kg(k) y(-1)=3 y(-2)=-5