Question

а)4/5×10/11
б)3/7:9/20

Answer 1

$frac{4}{5} times frac{10}{11} = frac{8}{11}$

$frac{3}{7} div frac{9}{20} = frac{3}{7} times frac{20}{9} = frac{20}{21}$

Answer 2

$frac{4}{5} times frac{10}{11} = 4 times frac{2}{11} = frac{8}{11} \ \ frac{3}{7} div frac{9}{20} = frac{3}{7} times frac{20}{9} = frac{1}{7} times frac{20}{3} = frac{20}{21}$

Удачи))))