Răspuns:
[tex]1 - \frac{1}{2} \div 0.5 \\ 1 - \frac{1}{2} \div \frac{5}{10} \\ 1 - \frac{1}{2} \times \frac{10}{5} \\ 1 - \frac{10}{10} \\ 1 - 1 \\ 0[/tex]
