【单选题】复数z=a+bi(a,b∈R)中,虚部为 ( )
【简答题】已知复数z=3+bi(b∈R),且(1+3i)z为纯虚数. (1)求复数z; (2)若 ,求复数w的模|w|.
【简答题】已知复数z=a+bi(a,b∈R)且a 2 +b 2 =25,(3+4i)z是纯虚数,求z的共轭复数.
【简答题】已知复数Z=a+bi(a,b εR),且 —(i—1)a+3b+2i=0 (I)求复数Z (II)若Z+ εR,求实数m的值.
【单选题】设复数z=1+bi(b∈R)且|z|=1,则复数z的虚部为( )
【单选题】复数z=a+bi(a,b∈R)的虚部记作Im(z),则Im = [ ]
【单选题】复数z=a+bi(a,b∈R)的实部记作Re(z)=a,则 [ ]