2. Выполните вычитание чисел: a) 75/11-3; 85/9-2/9; 62/5-2/5; 1-3/14; 7-5/17; 9-43/13; 1211/20-57/20;

Решение:

а)

• $$7\frac{5}{11}-3 = 4\frac{5}{11}$$
• $$8\frac{5}{9}-\frac{2}{9} = 8\frac{5-2}{9} = 8\frac{3}{9} = 8\frac{1}{3}$$
• $$6\frac{2}{5}-\frac{2}{5} = 6\frac{2-2}{5} = 6\frac{0}{5} = 6$$
• $$1-\frac{3}{14} = \frac{14}{14} - \frac{3}{14} = \frac{14-3}{14} = \frac{11}{14}$$
• $$7-\frac{5}{17} = 6\frac{17}{17} - \frac{5}{17} = 6\frac{17-5}{17} = 6\frac{12}{17}$$
• $$9-4\frac{3}{13} = 8\frac{13}{13} - 4\frac{3}{13} = 4\frac{13-3}{13} = 4\frac{10}{13}$$
• $$12\frac{11}{20}-5\frac{7}{20} = 7\frac{11-7}{20} = 7\frac{4}{20} = 7\frac{1}{5}$$

Ответ: $$4\frac{5}{11}$$, $$8\frac{1}{3}$$, $$6$$, $$\frac{11}{14}$$, $$6\frac{12}{17}$$, $$4\frac{10}{13}$$, $$7\frac{1}{5}$$