Question

помогите пожалуйста с математикой

Answer 1

$s{1} = 4 frac{1}{5} times 2 frac{6}{7} = frac{21 times 20}{5 times 7} = 12 \ a = s1 div b = 12 div 4 frac{2}{3} = 12 times frac{3}{14} = frac{18}{7} = 2 frac{4}{7}$