Question

Помогите пожалуйста​

Answer 1

$2) \frac{4}{7} \times \frac{21}{40} = \frac{1}{1} \times \frac{3}{10} = \frac{3}{10} \\ 3) \frac{27}{32 } \times \frac{8}{9} = \frac{3}{4} \times \frac{1}{1} = \frac{3}{4}$