# 杂项

### 从数字中去除单位或百分比

要从数字中去除单位、比率或百分比，请将其转换为“数字”（或小数）。

```
$100 as number    | 100
40/day to decimal | 40
20% as dec        | 0.2
```

### 比例 / 三项比例法则

这些短语被称为 [三项比例法则](https://en.wikipedia.org/wiki/Cross-multiplication#Rule_of_Three)，可帮助您找到维持比例所需的数字。

```
6 is to 60 as 8 is to what  | 80
5 is to 10 as what is to 80 | 40
```

这些短语也适用于单位：

```
5 km is to 500m as 5 cm is to what                | 5 mm
30 minutes is to 3 hours as what is to 60 seconds | 10 seconds
```

### 比较数字

min() 和 max() 在 Soulver 中

```
larger of 100 and 200  | 200
greater of 100 and 200 | 200
                                                     
smaller of 5 and 10    | 5
lesser of 5 and 10     | 5
```

### 中点

```
half of 175                  | 87.5
midpoint between 150 and 300 | 225
```

### 随机数

要生成指定范围内的随机整数：

```
random number between 1 and 10 | 7
```

要生成随机浮点数，请使用 0 到 1 的范围。

```
random number between 0 and 1 | 0.4793193723
```

### LCM 和 GCD

最小公倍数和最大公约数

```
gcd of 20 and 30 | 10
lcm of 5 and 8   | 40
```

### 排列与组合

```
10 permutation 3 | 720
25 combination 3 | 2,300
```

或者使用稍清晰的语法：

```
3 permutations of 10 | 720
3 combinations of 25 | 2,300
```

### 钳制

```
clamp 26 between 5 and 25 | 25
clamp 4 from 5 to 25      | 5
```


---

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