83. Выполните действие: a) 7\frac{5}{12}+4\frac{3}{8}; 6) 3\frac{11}{20}+2\frac{19}{30}; B) 9\frac{5}{6}-2\frac{3}{4}; г) 3\frac{3}{10}-1\frac{7}{15}.

a) $$7\frac{5}{12}+4\frac{3}{8} = 7\frac{10}{24}+4\frac{9}{24} = 11\frac{19}{24}$$

Ответ:$$11\frac{19}{24}$$

б) $$3\frac{11}{20}+2\frac{19}{30} = 3\frac{33}{60}+2\frac{38}{60} = 5\frac{71}{60} = 6\frac{11}{60}$$

Ответ:$$6\frac{11}{60}$$

в) $$9\frac{5}{6}-2\frac{3}{4} = 9\frac{10}{12}-2\frac{9}{12} = 7\frac{1}{12}$$

Ответ:$$7\frac{1}{12}$$

г) $$3\frac{3}{10}-1\frac{7}{15} = 3\frac{9}{30}-1\frac{14}{30} = 2\frac{39}{30}-1\frac{14}{30} = 1\frac{25}{30} = 1\frac{5}{6}$$

Ответ:$$1\frac{5}{6}$$