2. Выполните вычитание a) 8$$\frac{7}{9}$$-2$$\frac{4}{9}$$ б) 7$$\frac{1}{8}$$-2$$\frac{7}{8}$$ в) 5$$\frac{2}{11}$$-2$$\frac{9}{11}$$ г) 12-6$$\frac{4}{5}$$

Решение:

a) 8$$\frac{7}{9}$$-2$$\frac{4}{9}$$ = (8-2) + ($$\frac{7}{9}$$-$$\frac{4}{9}$$) = 6 + $$\frac{3}{9}$$ = 6 + $$\frac{1}{3}$$ = 6$$\frac{1}{3}$$

б) 7$$\frac{1}{8}$$-2$$\frac{7}{8}$$ = (7-2) + ($$\frac{1}{8}$$-$$\frac{7}{8}$$) = 5 - $$\frac{6}{8}$$ = 4$$\frac{8}{8}$$ - $$\frac{6}{8}$$ = 4$$\frac{2}{8}$$ = 4$$\frac{1}{4}$$

в) 5$$\frac{2}{11}$$-2$$\frac{9}{11}$$ = (5-2) + ($$\frac{2}{11}$$-$$\frac{9}{11}$$) = 3 - $$\frac{7}{11}$$ = 2$$\frac{11}{11}$$ - $$\frac{7}{11}$$ = 2$$\frac{4}{11}$$

г) 12-6$$\frac{4}{5}$$ = (12-6) - $$\frac{4}{5}$$ = 6 - $$\frac{4}{5}$$ = 5$$\frac{5}{5}$$ - $$\frac{4}{5}$$ = 5$$\frac{1}{5}$$

Ответ: a) 6$$\frac{1}{3}$$; б) 4$$\frac{1}{4}$$; в) 2$$\frac{4}{11}$$; г) 5$$\frac{1}{5}$$