答案：270÷9=30
540÷6=90
420÷7=60
900÷3=300
320÷4=80
640÷8=80

答案：$\begin{array}{r} \boxed{9}\ \boxed{5}\\ 3\enclose{longdiv} {2\ 8\ 5}\\ \boxed{2}\ \boxed{7}\\ \hline \boxed{1}\ \boxed{5}\\ \boxed{1}\ \boxed{5}\\ \hline \ \ \ \ \ \boxed{0}\end{array}$
$\begin{array}{r} \boxed{5}\ \boxed{4}\\ 6\enclose{longdiv} {3\ 2\ 5}\\ \boxed{3}\ \boxed{0}\\ \hline \boxed{2}\ \boxed{5}\\ \boxed{2}\ \boxed{4}\\ \hline \ \ \ \ \ \boxed{1}\end{array}$
$\begin{array}{r} \boxed{6}\ \boxed{1}\\ 8\enclose{longdiv} {4\ 8\ 8}\\ \boxed{4}\ \boxed{8}\\ \hline \ \ \ \ \ \ \ \boxed{8}\\ \ \ \ \ \ \ \ \boxed{8}\\ \hline \ \ \ \ \ \ \ \boxed{0}\end{array}$

答案：$392÷5=78······2$
竖式：
```
7 8
5)3 9 2
3 5
----
4 2
4 0
----
2
```
验算：
```
7 8
× 5
----
3 9 0
+ 2
----
3 9 2
```
---
$508÷6=84······4$
竖式：
```
8 4
6)5 0 8
4 8
----
2 8
2 4
----
4
```
验算：
```
8 4
× 6
----
5 0 4
+ 4
----
5 0 8
```
---
$235÷8=29······3$
竖式：
```
2 9
8)2 3 5
1 6
----
7 5
7 2
----
3
```
验算：
```
2 9
× 8
----
2 3 2
+ 3
----
2 3 5
```
---
$650÷7=92······6$
竖式：
```
9 2
7)6 5 0
6 3
----
2 0
1 4
----
6
```
验算：
```
9 2
× 7
----
6 4 4
+ 6
----
6 5 0
```