题目内容
复数
=( )
| 3+i |
| 1-3i |
| A.i | B.-i | C.2i | D.-2i |
| 3+i |
| 1-3i |
=
| (3+i)(1+3i) |
| (1-3i)(1+3i) |
=
| 3+i+9i+3i2 |
| 10 |
=i.
选A.
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题目内容
| 3+i |
| 1-3i |
| A.i | B.-i | C.2i | D.-2i |
| 3+i |
| 1-3i |
| (3+i)(1+3i) |
| (1-3i)(1+3i) |
| 3+i+9i+3i2 |
| 10 |