设f (x)=,则f [ f ()]=
若复数z=1-2i,则z+z=________.
复数z=3+4i对应的点Z关于原点的对称点为Z1,则向量对应的复数为________.
复数z=(a2-2a)+(a2-a-2)i(a∈R)对应的点在虚轴上,则a的值为________.
复数=________.
设复数z满足i(z+1)=-3+2i,则z的实部为________.