7和9的短除法怎么写

7和9的短除法是指用7去除以9，由于7小于9，所以9不能被7整除。以下是7除以9的短除法步骤：

```

1.2857142857...

---------------

9 7.0000000000...

6.3

--------

0.7000000000...

0.63

--------

0.0700000000...

0.063

--------

0.0070000000...

0.0063

--------

0.0007000000...

0.00063

--------

0.0000700000...

0.000063

--------

0.0000070000...

0.0000063

--------

0.0000007000...

0.00000063

--------

0.0000000700...

0.000000063

--------

0.0000000070...

0.0000000063

--------

0.0000000007...

0.00000000063

--------

0.00000000007...

0.000000000063

--------

0.000000000007...

0.0000000000063

--------

0.0000000000007...

0.00000000000063

--------

0.00000000000007...

0.000000000000063

--------

0.000000000000007...

0.00000000000000063

--------

0.00000000000000007...

0.000000000000000063

--------

0.000000000000000007...

0.00000000000000000063

--------

0.00000000000000000007...

0.000000000000000000063

--------

0.000000000000000000007...

0.00000000000000000000063

--------

0.00000000000000000000007...

0.000000000000000000000063

--------

0.000000000000000000000007...

0.00000000000000000000000063

--------

0.00000000000000000000000007...

0.000000000000000000000000063

--------

0.000000000000000000000000007...

0.0000000000000000000000000063

--------

0.0000000000000000000000000007...

0.00000000000000000000000000063

--------

0.00000000000000000000000000007...

0.000000000000000000000000000063

--------

0.000000000000000000000000000007...

0.0000000000000000000000000000063

--------

0.0000000000000000000000000000007...

0.00000000000000000000000000000063

--------

0.00000000000000000000000000000007...

0.000000000000000000000000000000063

--------

0.000000000000000000000000000000007...

0.00000000000000000000000000000000063

--------

0.00000000000000000000000000000000007...

0.000000000000000000000000000000000063

--------

0.000000000000000000000000000000000007...

0.00000000000000000000000000000000000063

--------

0.00000000000000000000000000000000000007...

0.000000000000000000000000000000000000063

--------

0.000000000000000000000000000000000000007...

0.00000000000000000000000000000000000000063

--------

0.00000000000000000000000000000000000000007...

0.000000000000000000000000000000000000000063

--------

0.000000000000000000000000000000000000000007...

0.00000000000000000000000000000000000000000063

--------

0.00000000000000000000000000000000000000000007...

0.000000000000000000000000000000000000000000063

--------

0.0000000000000000000000000000000000000000000007...

0.00000000000000000000000000000000000000000000063

--------

0.00000000000000000000000000000000000000000000007...

0.000000000000000000000000000000000000000000000063

--------

0.000000000000000000000000000000000000000000000007...

0.00000000000000000000000000000000000000000000000063

--------

Continue indefinitely

```

在短除法中，由于7小于9，我们无法找到一个整数商，因此商为0，余数为7。然后，我们在余数后面添加一个0，变成70，再除以9，得到7余7，重复这个过程，得到一个无限循环的小数0.777777777...，也就是7/9。这个除法过程没有结束，因为余数7永远不会变成0。