a) \(\frac{3}{5} \cdot \frac{1}{3} = \frac{3 \cdot 1}{5 \cdot 3} = \frac{3}{15} = \frac{1}{5}\)
б) \(\frac{2}{5} \cdot \frac{5}{8} = \frac{2 \cdot 5}{5 \cdot 8} = \frac{10}{40} = \frac{1}{4}\)
в) \(\frac{4}{11} \cdot 11 = \frac{4 \cdot 11}{11} = \frac{44}{11} = 4\)
г) \(\frac{1}{8} \cdot \frac{16}{5} = \frac{1 \cdot 16}{8 \cdot 5} = \frac{16}{40} = \frac{2}{5}\)
д) \(\frac{11}{20} \cdot 5 = \frac{11 \cdot 5}{20} = \frac{55}{20} = \frac{11}{4} = 2\frac{3}{4}\)