№1. Вычислите: А) 6/57+4 Б) 6 4/9+5 2/9 В) 11 8/11-3 5/11

Решим примеры:

А) $$ \frac{6}{57} + 4 = \frac{6}{57} + \frac{4 \cdot 57}{57} = \frac{6 + 228}{57} = \frac{234}{57} = \frac{78}{19} = 4 \frac{2}{19} $$

Б) $$ 6 \frac{4}{9} + 5 \frac{2}{9} = (6 + 5) + (\frac{4}{9} + \frac{2}{9}) = 11 + \frac{6}{9} = 11 + \frac{2}{3} = 11 \frac{2}{3} $$

В) $$ 11 \frac{8}{11} - 3 \frac{5}{11} = (11 - 3) + (\frac{8}{11} - \frac{5}{11}) = 8 + \frac{3}{11} = 8 \frac{3}{11} $$

Ответ: А) $$4 \frac{2}{19}$$, Б) $$11 \frac{2}{3}$$, В) $$8 \frac{3}{11}$$