1. Найдите сумму:
а) 2$$\frac{7}{15}$$ + 3$$\frac{13}{15}$$ = (2+3) + ($$\frac{7}{15}$$ +$$\frac{13}{15}$$) = 5 + $$\frac{20}{15}$$ = 5 + 1$$\frac{5}{15}$$ = 6$$\frac{5}{15}$$ = 6$$\frac{1}{3}$$.
Ответ: 6$$\frac{1}{3}$$.
б) 4$$\frac{8}{18}$$ + 2$$\frac{6}{18}$$ = (4+2) + ($$\frac{8}{18}$$ +$$\frac{6}{18}$$) = 6 + $$\frac{14}{18}$$ = 6$$\frac{14}{18}$$ = 6$$\frac{7}{9}$$.
Ответ: 6$$\frac{7}{9}$$.
в) 5$$\frac{5}{12}$$ + 1$$\frac{11}{12}$$ = (5+1) + ($$\frac{5}{12}$$ +$$\frac{11}{12}$$) = 6 + $$\frac{16}{12}$$ = 6 + 1$$\frac{4}{12}$$ = 7$$\frac{4}{12}$$ = 7$$\frac{1}{3}$$.
Ответ: 7$$\frac{1}{3}$$.