1. 比一比，算一算。
$12 ÷ 3 =$ $42 ÷ 7 =$ $18 ÷ 2 =$
$120 ÷ 3 =$ $420 ÷ 7 =$ $180 ÷ 2 =$
$126 ÷ 3 =$ $427 ÷ 7 =$ $186 ÷ 2 =$

$12 ÷ 3 = 4$
$120 ÷ 3 = 40$
$126 ÷ 3 = 42$
$42 ÷ 7 = 6$
$420 ÷ 7 = 60$
$427 ÷ 7 = 61$
$18 ÷ 2 = 9$
$180 ÷ 2 = 90$
$186 ÷ 2 = 93$

2.
$\begin{array}{r} & \boxed{} \boxed{}\\ 5)\overline{2}&5 &5\\ & \boxed{} \boxed{}\\ & \boxed{}\\ & \boxed{} \end{array}$
$\begin{array}{r} & \boxed{} \boxed{}\\ 6)\overline{5}&4 &6\\ & \boxed{} \boxed{}\\ & \boxed{}\\ & \boxed{} \end{array}$
$\begin{array}{r} & \boxed{} \boxed{}\\ 3)\overline{1}&8 &6\\ & \boxed{} \boxed{}\\ & \boxed{}\\ & \boxed{} \end{array}$
$\begin{array}{r} & \boxed{} \boxed{}\\ 3)\overline{2}&7 &9\\ & \boxed{} \boxed{}\\ & \boxed{}\\ & \boxed{} \end{array}$

```
51
5)255
25
5
5
```
```
91
6)546
54
6
6
```
```
62
3)186
18
6
6
```
```
93
3)279
27
9
9
```

3. 解决问题。
(1) 整个图形表示$126$，表示()。
整个图形表示$639$，表示()。
(2) 小王师傅平均$2$小时加工零件$164$个，小李师傅平均每小时加工零件$72$个。谁做得快？
(3) 妈妈去超市花了$200$元钱，买来下面这些商品。
每盒巧克力多少元？

答案略