11.函数 omega =dfrac (1)(z) 将z平面上的下列曲线变成w平面上的什么曲线 (z=-|||-+iy, omega =u+iv) ?-|||-(1) ^2+(y)^2=4;-|||-(2) y=x ;-|||-(3) x=1 ;-|||-(4) ((x-1))^2+(y)^2=1.