Практикуемся 4) \(13 \frac{1}{2} : 1 \frac{1}{3} + 16 \frac{1}{2} \cdot 1 \frac{1}{11} + 19 \frac{1}{4} : \frac{4}{25} \)

4) \(13 \frac{1}{2} : 1 \frac{1}{3} + 16 \frac{1}{2} \cdot 1 \frac{1}{11} + 19 \frac{1}{4} : \frac{4}{25} = \frac{27}{2} \cdot \frac{3}{4} + \frac{33}{2} \cdot \frac{12}{11} + \frac{77}{4} \cdot \frac{25}{4} = \frac{81}{8} + 18 + \frac{1925}{16} = \frac{162}{16} + \frac{288}{16} + \frac{1925}{16} = \frac{2375}{16}= 148 \frac{7}{16}\)