Какие дроби неравны?

• \(\frac{30}{66}\) и \(\frac{6}{11}\)
• \(\frac{1}{8}\) и \(\frac{5}{40}\)
• \(\frac{6}{7}\) и \(\frac{24}{28}\)
• \(\frac{1}{2}\) и \(\frac{5}{10}\)