| a |
| 1−i |
| b |
| 1−2i |
| 5 |
| 3+i |
| a(1+i) |
| 2 |
| b(1+2i) |
| 5 |
| 5(3−i) |
| 10 |
即 (
| a |
| 2 |
| b |
| 5 |
| a |
| 2 |
| 2b |
| 5 |
| 3 |
| 2 |
| i |
| 2 |
| a |
| 2 |
| b |
| 5 |
| 3 |
| 2 |
| a |
| 2 |
| 2b |
| 5 |
| 1 |
| 2 |
∴a=7，b=-10，故复数Z在复平面内对应的点是（7，-10），
故选 D．
| a |
| 1−i |
| b |
| 1−2i |
| 5 |
| 3+i |
| a |
| 1−i |
| b |
| 1−2i |
| 5 |
| 3+i |
| a(1+i) |
| 2 |
| b(1+2i) |
| 5 |
| 5(3−i) |
| 10 |
| a |
| 2 |
| b |
| 5 |
| a |
| 2 |
| 2b |
| 5 |
| 3 |
| 2 |
| i |
| 2 |
| a |
| 2 |
| b |
| 5 |
| 3 |
| 2 |
| a |
| 2 |
| 2b |
| 5 |
| 1 |
| 2 |