来自刘希涛的问题
【已知复数z=1-2i,那么1.z=()A.55+255iB.55−255iC.15+25iD.15−25i】
已知复数z=1-2i,那么1.
z=()
A.
55+2
55i
B.
55−2
55i
C.15+25i
D.15−25i
1回答
2020-02-07 00:18
【已知复数z=1-2i,那么1.z=()A.55+255iB.55−255iC.15+25iD.15−25i】
已知复数z=1-2i,那么1.
z=()
A.
55+2
55i
B.
55−2
55i
C.15+25i
D.15−25i
1.
z=11+2i=1−2i(1+2i)(1−2i)=1−2i1+2