1/2-1/1

To solve \( \frac{1}{2} - \frac{1}{1} \):

First, note that \( \frac{1}{1} \) is equal to 1.

Now, rewrite the expression:

\[ \frac{1}{2} - 1 \]

To perform the subtraction, convert 1 into a fraction with a common denominator:

\[ 1 = \frac{2}{2} \]

Now, substituting back into the expression:

\[ \frac{1}{2} - \frac{2}{2} \]

This gives:

\[ \frac{1 - 2}{2} = \frac{-1}{2} \]

So, \( \frac{1}{2} - 1 = -\frac{1}{2} \).