freeCodeCamp/guide/chinese/mathematics/complex-numbers-introduction/index.md

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---
title: Complex Numbers Introduction
localeTitle: 复数引言
---
## 复数引言
复数是可以以z = a + ib的形式表示的任何数字。
![一世](https://www.codeproject.com/KB/cpp/882975/SquareRoot1.png)
a被称为复数的实部b被称为虚部。
#### 注意
纯虚数或纯实数也是复数。
#### 例子
1. 2i + 1的真正部分是什么 A.实际部分1
2. 2 - 4i的想象部分是什么 A.虚构部分:-4
3. 这是一个复数z = 2i吗是的因为我们可以将此数字写为z = 0 + 2i。
4. 这是一个复数z = 4吗是的因为我们可以将此数字写为z = 4 + 0i。
#### 更多信息:
* [维基百科:复数](https://en.wikipedia.org/wiki/Complex_number)
* [更多信息](https://www.khanacademy.org/math/algebra2/introduction-to-complex-numbers-algebra-2/the-complex-numbers-algebra-2/a/intro-to-complex-numbers)