Пошаговое объяснение:

[tex]1) \frac{3}{4} \times \frac{5}{6} = \frac{3 \times 5}{4 \times 6} = \frac{15}{24} = \frac{5 \times 3}{8 \times 3} = \frac{5}{8} [/tex]

[tex]2) \frac{5}{8} \times \frac{8}{16} = \frac{5}{8} \times \frac{1 \times 8}{2 \times 8} = \frac{5 \times 1}{8 \times 2} = \frac{5}{16} [/tex]