题目内容
复数
(i是虚数单位)的模等于______.
| 5 |
| 2-i |
∵复数
=
=2+i,
∴|
|
=|2+i|
=
=
,
故答案为:
.
| 5 |
| 2-i |
| 5(2+i) |
| (2-i)(2+i) |
∴|
| 5 |
| 2-i |
=|2+i|
=
| (2)2+12 |
=
| 5 |
故答案为:
| 5 |
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题目内容
| 5 |
| 2-i |
| 5 |
| 2-i |
| 5(2+i) |
| (2-i)(2+i) |
| 5 |
| 2-i |
| (2)2+12 |
| 5 |
| 5 |