а) $$4\frac{4}{9}:2\frac{2}{3}=\frac{40}{9}:\frac{8}{3}=\frac{40}{9} \cdot \frac{3}{8}=\frac{5 \cdot 1}{3 \cdot 1}=\frac{5}{3}=1\frac{2}{3}$$
г) $$1,21 : 3\frac{2}{3} = 1,21 : \frac{11}{3} = \frac{121}{100} : \frac{11}{3} = \frac{121}{100} \cdot \frac{3}{11} = \frac{11 \cdot 3}{100} = \frac{33}{100} = 0,33$$
Ответ: a) $$1\frac{2}{3}$$, г) $$0,33$$