Ответ:

[tex]2 \frac{5}{14} \times 4 \frac{2}{3} = \frac{33}{14} \times \frac{14}{3} = \frac{11}{1} \times \frac{1}{1} = 11[/tex]

[tex] \frac{6}{42} \times \frac{8}{3} = \frac{2}{21} \times \frac{4}{1} = \frac{8}{21} [/tex]