1/2:1/2

It looks like you're presenting a mathematical ratio. The expression \( \frac{1}{2} : \frac{1}{2} \) represents a ratio of two fractions.

To simplify this ratio:

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

This means that both parts of the ratio are equal. If you have any further questions or need clarification, feel free to ask!