1/2:1/4=0,25

The expression \( \frac{1}{2} : \frac{1}{4} \) represents the division of two fractions. To compute this, you can multiply by the reciprocal of the divisor:

\[ \frac{1}{2} : \frac{1}{4} = \frac{1}{2} \times \frac{4}{1} = \frac{1 \times 4}{2 \times 1} = \frac{4}{2} = 2 \]

So, \( \frac{1}{2} : \frac{1}{4} = 2 \), not \( 0.25 \).

If you have any further questions or need additional explanations, feel free to ask!