Найдите сумму или разность:
а) \(\frac{1}{5} + \frac{1}{7} \)
б) \(\frac{1}{4} + \frac{1}{9}\)
в) \(\frac{4}{7} + \frac{4}{9} \)
г) \(\frac{1}{2} + \frac{5}{7} \)
д) \(\frac{9}{11} + 0 \)
е) \(\frac{3}{4} - \frac{3}{5} \)
ж) \(\frac{1}{3} - \frac{1}{4}\)
з) \(\frac{3}{7} - \frac{2}{9} \)
и) \(\frac{4}{9} - \frac{2}{5} \)
к) \(\frac{11}{13} - 0\)
л) \(\frac{2}{3} + \frac{3}{5}\)
м) \(\frac{2}{3} + \frac{3}{12} \)
\(\frac{1}{5} + \frac{1}{7} = \frac{7}{35} + \frac{5}{35} = \frac{12}{35}\).
\(\frac{1}{4} + \frac{1}{9} = \frac{9}{36} + \frac{4}{36} = \frac{13}{36}\).
\(\frac{4}{7} + \frac{4}{9} = \frac{36}{63} + \frac{28}{63} = \frac{64}{63} = 1 \frac{1}{63}\).
\(\frac{1}{2} + \frac{5}{7} = \frac{7}{14} + \frac{10}{14} = \frac{17}{14} = 1 \frac{3}{14}\).
\(\frac{9}{11} + 0 = \frac{9}{11}\).
\(\frac{3}{4} - \frac{3}{5} = \frac{15}{20} - \frac{12}{20} = \frac{3}{20}\).
\(\frac{1}{3} - \frac{1}{4} = \frac{4}{12} - \frac{3}{12} = \frac{1}{12}\).
\(\frac{3}{7} - \frac{2}{9} = \frac{27}{63} - \frac{14}{63} = \frac{13}{63}\).
\(\frac{4}{9} - \frac{2}{5} = \frac{20}{45} - \frac{18}{45} = \frac{2}{45}\).
\(\frac{11}{13} - 0 = \frac{11}{13}\).
\(\frac{2}{3} + \frac{3}{5} = \frac{10}{15} + \frac{9}{15} = \frac{19}{15} = 1 \frac{4}{15}\).
\(\frac{2}{3} + \frac{3}{12} = \frac{8}{12} + \frac{3}{12} = \frac{11}{12}\).
Решебник
"Математика - Учебник. Часть 2" по предмету Математика за 5 класс.
Aвторы:
Александрова Л.А., Виленкин Н.Я., Жохов В.И., Чесноков А.С., Шварцбурд С.И.
Задание
Найдите сумму или разность: а) \(\frac{1}{5} + \frac{1}{7} \) б) \(\frac{1}{4} + \frac{1}{9}\) в) \(\frac{4}{7} + \frac{4}{9} \) г) \(\frac{1}{2} + \frac{5}{7} \) д) \(\frac{9}{11} + 0 \) е) \(\frac{3}{4} - \frac{3}{5} \) ж) \(\frac{1}{3} - \frac{1}{4}\) з) \(\frac{3}{7} - \frac{2}{9} \) и) \(\frac{4}{9} - \frac{2}{5} \) к) \(\frac{11}{13} - 0\) л) \(\frac{2}{3} + \frac{3}{5}\) м) \(\frac{2}{3} + \frac{3}{12} \)