问题
选择题
若复数z=(a2-2)+(a+
|
答案
∵复数z=(a2-2)+(a+
)i为纯虚数2
∴
,即a=a2-2=0 a+
≠02 2
=a-i2013 1+ai
=
-i503×4+12 1+
i2
=(
-i)(1-2
i)2 (1+
i)(1-2
i)2
=-i-3i 3
故选A.
若复数z=(a2-2)+(a+
|
∵复数z=(a2-2)+(a+
)i为纯虚数2
∴
,即a=a2-2=0 a+
≠02 2
=a-i2013 1+ai
=
-i503×4+12 1+
i2
=(
-i)(1-2
i)2 (1+
i)(1-2
i)2
=-i-3i 3
故选A.