[tex]2\frac{1}{3}:\frac{5}{4}=\frac{7}{3}\cdot\frac{4}{5}=\frac{28}{15}=1\frac{13}{15}\\\\\frac{3}{10}:2\frac{3}{4}=\frac{3}{10}:\frac{11}{4}=\frac{3}{10}\cdot\frac{4}{11}=\frac{12}{110}=\frac{6}{55}\\\\2\frac{2}{3}:1\frac{7}{9}=\frac{8}{3}:\frac{16}{9}=\frac{8}{3}\cdot\frac{9}{16}=\frac{3}{2}=1\frac{1}{2}[/tex]