Вычислите: a) 2 1/2 : 1 1/3

а) \(2 \frac{1}{2} \div 1 \frac{1}{3} = \frac{5}{2} \div \frac{4}{3} = \frac{5}{2} \times \frac{3}{4} = \frac{15}{8} = 1 \frac{7}{8}\)