17.研究下列区域,并判断其开闭性、有界性、连通性:-|||-(1) lt arcsin (z-i)lt dfrac (pi )(4);-|||-(2) lt Re(-iz)lt 1 ;-|||-(3) |z|leqslant 2-Rez;-|||-(4) leqslant |z-1|leqslant 3.