1/1-1/2

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

1. Start with \( 1 \), which can be expressed as \( \frac{2}{2} \) so that both fractions have a common denominator: \[ \frac{1}{1} = \frac{2}{2} \]

2. Now perform the subtraction: \[ \frac{2}{2} - \frac{1}{2} = \frac{2 - 1}{2} = \frac{1}{2} \]

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