A)
[tex] \frac{1}{2} + \frac{2}{3} \div \frac{10}{9} \\ \\ \frac{1}{2} + \frac{2}{3} \times \frac{9}{10} [/tex]
[tex] \frac{1}{2} + \frac{3}{5} \\ \\ \frac{11}{10} [/tex]
B)
[tex] \frac{15}{4} \times \frac{8}{3} - \frac{1}{2} \\ \\ 5 \times 2 - \frac{1}{2} [/tex]
[tex]10 - \frac{1}{2} \\ \\ \frac{19}{2} [/tex]
