freeCodeCamp/guide/chinese/mathematics/absolute-value/index.md

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---
title: Absolute Value
localeTitle: 绝对值
---
## 绝对值
绝对值是数字的正值。 您可以将数字的绝对值视为距离零的距离。 它可以定义为,
![IMG](https://latex.codecogs.com/gif.latex?%5Cdpi%7B120%7D%20%5Clarge%20y%20%3D%20%5Cleft%20%7C%20x%20%5Cright%20%7C%20%3D%20%5Cleft%5C%7B%5Cbegin%7Bmatrix%7D%20x%20%26%20for%20%5C%2C%20x%20%5Cgeq%200%20%5C%5C%20-x%20%26%20for%20%5C%2Cx%20%3C0%20%5Cend%7Bmatrix%7D%5Cright.)
![](https://upload.wikimedia.org/wikipedia/commons/thumb/6/6b/Absolute_value.svg/2000px-Absolute_value.svg.png)
在这里你可以看到在y = | x |的图形中,如果-2输入到函数中则2是结果。这是因为-2与零的距离为2。数字的绝对值永远不会是负数。
### 例子
* **简化| -5 |**
| -5 | = 5
* **简化| 05|**
| 05| = | 0 | = 0
* **简化 - | -1 |**
\- | -1 | = - 1= -1
* **简化| -5-3+ 1 |**
| -5-3+ 1 | = | 15 + 1 | = | 16 | = 16
* **简化| 8 |**
| 8 | = 8
* **简化|-5^ 3 |** | -125 | = 125
#### 更多信息:
[绝对值](http://www.purplemath.com/modules/absolute.htm "Absolute Value")