1/7-8/1

To calculate \( \frac{1}{7} - \frac{8}{1} \), we first convert \( \frac{8}{1} \) to a fraction with a common denominator of 7:

\[ \frac{8}{1} = \frac{8 \times 7}{1 \times 7} = \frac{56}{7} \]

Now we can rewrite the original expression:

\[ \frac{1}{7} - \frac{56}{7} = \frac{1 - 56}{7} = \frac{-55}{7} \]

Thus, the result is:

\[ \frac{-55}{7} \text{ or } -7\frac{6}{7} \]