а) $$8\frac{9}{16}+2\frac{16}{24} = 8\frac{9}{16}+2\frac{2}{3} = 8\frac{27}{48}+2\frac{32}{48} = 10\frac{59}{48} = 10 + 1\frac{11}{48} = 11\frac{11}{48}$$
Ответ: $$11\frac{11}{48}$$