已知复数z满足z•i+z1−i=3+4i(i是虚数单位),则z=( ) A.3+i B.4-3i C.2-3i D.3-i
问题描述:
已知复数z满足z•i+
=3+4i(i是虚数单位),则z=( )z 1−i
A. 3+i
B. 4-3i
C. 2-3i
D. 3-i
答
z•i+
=3+4i可得z (i+z 1−i
)=3+4i即z(1 1−i
)=3+4i2+i 1−i
所以z=(3+4i)(
)=1−i 2+i
=3−i.7+i 2+i
故选D.