题目内容
(1)计算(
)2+
(2)复数Z=x+yi(x,y∈R)满足Z+2i
=3+i,求点Z所在的象限.
1+i | ||
|
5i |
3+4i |
(2)复数Z=x+yi(x,y∈R)满足Z+2i
. |
Z |
(1)(
)2+
=
+
=i+
i+
=
+
i;
(2)把z=x+yi代入z+2i
=3+i,
得x+yi+2i(x-yi)=3+i
所以(x+2y)+(2x+y)i=3+i
则
,解得
.
所以复数z对应的点在第二象限.
1+i | ||
|
5i |
3+4i |
=
(1+i)2 |
2 |
5i(3-4i) |
25 |
=i+
3 |
5 |
4 |
5 |
4 |
5 |
8 |
5 |
(2)把z=x+yi代入z+2i
. |
z |
得x+yi+2i(x-yi)=3+i
所以(x+2y)+(2x+y)i=3+i
则
|
|
所以复数z对应的点在第二象限.
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