题目内容
若复数z=-
+
i(i为虚数单位),
是z的共轭复数,则在复平面内,复数z2+
对应的点的坐标为( )
| 1 |
| 2 |
| ||
| 2 |
| . |
| z |
| . |
| z |
| A.(0,1) | B.(1,-
| C.(-1,-
| D.(-1,0) |
∵z=-
+
i,∴
=-
-
i,
故z2+
=(-
+
i)2-
-
i
=
-
i+
i2-
-
i
=-1-
i
故复数对应的点的坐标为(-1,-
),
故选C
| 1 |
| 2 |
| ||
| 2 |
| . |
| z |
| 1 |
| 2 |
| ||
| 2 |
故z2+
| . |
| z |
| 1 |
| 2 |
| ||
| 2 |
| 1 |
| 2 |
| ||
| 2 |
=
| 1 |
| 4 |
| ||
| 2 |
| 3 |
| 4 |
| 1 |
| 2 |
| ||
| 2 |
=-1-
| 3 |
故复数对应的点的坐标为(-1,-
| 3 |
故选C
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