2 Найдите сумму: а) \(\frac{3}{5}+\frac{4}{5}\); б) \(\frac{2}{3}+\frac{3}{18}\); в) \(\frac{5}{7}+\frac{6}{18}\)

Question

Вопрос:

Ответ:

Accepted Answer

а) \(\frac{3}{5}+\frac{4}{5}=\frac{3+4}{5}=\frac{7}{5}=1\frac{2}{5}\)
Ответ: \(1\frac{2}{5}\)
б) \(\frac{2}{3}+\frac{3}{18}=\frac{2\cdot6}{3\cdot6}+\frac{3}{18}=\frac{12}{18}+\frac{3}{18}=\frac{12+3}{18}=\frac{15}{18}=\frac{5}{6}\)
Ответ: \(\frac{5}{6}\)
в) \(\frac{5}{7}+\frac{6}{18}=\frac{5}{7}+\frac{1}{3}=\frac{5\cdot3}{7\cdot3}+\frac{1\cdot7}{3\cdot7}=\frac{15}{21}+\frac{7}{21}=\frac{15+7}{21}=\frac{22}{21}=1\frac{1}{21}\)
Ответ: \(1\frac{1}{21}\)