求下列離散信號(hào)的Z變換,并注明收斂域 (a)n-2) (b)a-nε(n) (c)0.5n-1ε(n-1) (d)(0.5n+0.25n)ε(n)
求下列F(z)的反變換f(n)
(a) 因?yàn)?img src="https://newimg.ppkao.com/2019-07/liuye/2019071916045468504.jpg" />