6. Выполните действия:
1) $$9\frac{5}{9}+5\frac{1}{4}-8\frac{3}{8} = 9\frac{40}{72}+5\frac{18}{72}-8\frac{27}{72} = (9+5-8) + \frac{40+18-27}{72} = 6\frac{31}{72}$$.
Ответ: $$6\frac{31}{72}$$
2) $$7\frac{11}{12}+6\frac{1}{15}-8,3 = 7\frac{55}{60}+6\frac{4}{60}-8\frac{3}{10} = 7\frac{55}{60}+6\frac{4}{60}-8\frac{18}{60} = (7+6-8) + \frac{55+4-18}{60} = 5\frac{41}{60}$$.
Ответ: $$5\frac{41}{60}$$