№3. Найти значение выражений A) \(\frac{3}{4} + \frac{1}{12}\) Б) \(\frac{6}{6} + \frac{3}{8}\) B) \(\frac{5}{5} - \frac{1}{15}\) Г) \(\frac{2}{3} - \(\frac{1}{7}\)

Ответ:

• А) \(\frac{3}{4} + \frac{1}{12}\) = \(\frac{3 \times 3}{4 \times 3} + \frac{1}{12} = \frac{9}{12} + \frac{1}{12} = \frac{10}{12} = \frac{5}{6}\)
• Б) \(\frac{6}{6} + \frac{3}{8}\) = \(1 + \frac{3}{8} = \frac{8}{8} + \frac{3}{8} = \frac{11}{8} = 1\frac{3}{8}\)
• В) \(\frac{5}{5} - \frac{1}{15}\) = \(1 - \frac{1}{15} = \frac{15}{15} - \frac{1}{15} = \frac{14}{15}\)
• Г) \(\frac{2}{3} - \(\frac{1}{7}\) = \(\frac{2 \times 7}{3 \times 7} - \frac{1 \times 3}{7 \times 3} = \frac{14}{21} - \frac{3}{21} = \frac{11}{21}\)

Ответ: А) \(\frac{5}{6}\), Б) \(1\frac{3}{8}\), В) \(\frac{14}{15}\), Г) \(\frac{11}{21}\)