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nshen committed Jan 18, 2018
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Expand Up @@ -812,7 +812,7 @@ function fPrime (x) {
}
```

使用多个撇号可以用来表示 二阶导函数(derivative) *ƒ′′*二阶导函数(derivative)*ƒ′′′* ,之后更高的数字,一般作者会用罗马数字 *ƒ*<sup>IV</sup> 或上标数字 *ƒ*<sup>(n)</sup> 表示。
使用多个撇号可以用来表示 二阶导函数(derivative) *ƒ′′*三阶导函数(derivative)*ƒ′′′* ,之后更高的数字,一般作者会用罗马数字 *ƒ*<sup>IV</sup> 或上标数字 *ƒ*<sup>(n)</sup> 表示。

## 向下取整和向上取整(floor & ceiling)

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