⅘ > ⅚

$$\frac{5}{7}+\frac{8}{7}=\frac{13}{14}$$

$$28\ \frac{11}{18}+14\ \frac{31}{45}=42\ \frac{117}{90}$$

$$\frac{7}{15}-\frac{5}{15}=\frac{2}{15}$$

$$11\ \frac{1}{3}-6\ \frac{1}{2}=5\ \frac{1}{6}$$

$$\frac{2}{9}\times6=\frac{12}{54}$$

$$3\ \frac{1}{8}\times5\ \frac{3}{5}=15\ \frac{3}{40}$$

$$6\div\frac{9}{11}=\frac{22}{3}$$