Алгебра
Английский
Биология
География
Геометрия
История
Русский
Обществознание
Физика
Химия
Информатика
Литература
Математика
Ответ:
a) \(\frac{5}{14} + \frac{5}{21} = \frac{5 \times 3}{14 \times 3} + \frac{5 \times 2}{21 \times 2} = \frac{15}{42} + \frac{10}{42} = \frac{25}{42}\)
б) \(\frac{5}{14} - \frac{5}{21} = \frac{5 \times 3}{14 \times 3} - \frac{5 \times 2}{21 \times 2} = \frac{15}{42} - \frac{10}{42} = \frac{5}{42}\)
в) \(\frac{17}{30} + \frac{11}{70} = \frac{17 \times 7}{30 \times 7} + \frac{11 \times 3}{70 \times 3} = \frac{119}{210} + \frac{33}{210} = \frac{152}{210} = \frac{76}{105}\)
г) \(\frac{17}{30} - \frac{11}{70} = \frac{17 \times 7}{30 \times 7} - \frac{11 \times 3}{70 \times 3} = \frac{119}{210} - \frac{33}{210} = \frac{86}{210} = \frac{43}{105}\)
д) \(\frac{9}{22} + \frac{2}{121} = \frac{9 \times 11}{22 \times 11} + \frac{2 \times 2}{121 \times 2} = \frac{99}{242} + \frac{4}{242} = \frac{103}{242}\)
\(\ne\)) \(\frac{9}{22} - \frac{2}{121} = \frac{9 \times 11}{22 \times 11} - \frac{2 \times 2}{121 \times 2} = \frac{99}{242} - \frac{4}{242} = \frac{95}{242}\)
б) \(\frac{5}{14} - \frac{5}{21} = \frac{5 \times 3}{14 \times 3} - \frac{5 \times 2}{21 \times 2} = \frac{15}{42} - \frac{10}{42} = \frac{5}{42}\)
в) \(\frac{17}{30} + \frac{11}{70} = \frac{17 \times 7}{30 \times 7} + \frac{11 \times 3}{70 \times 3} = \frac{119}{210} + \frac{33}{210} = \frac{152}{210} = \frac{76}{105}\)
г) \(\frac{17}{30} - \frac{11}{70} = \frac{17 \times 7}{30 \times 7} - \frac{11 \times 3}{70 \times 3} = \frac{119}{210} - \frac{33}{210} = \frac{86}{210} = \frac{43}{105}\)
д) \(\frac{9}{22} + \frac{2}{121} = \frac{9 \times 11}{22 \times 11} + \frac{2 \times 2}{121 \times 2} = \frac{99}{242} + \frac{4}{242} = \frac{103}{242}\)
\(\ne\)) \(\frac{9}{22} - \frac{2}{121} = \frac{9 \times 11}{22 \times 11} - \frac{2 \times 2}{121 \times 2} = \frac{99}{242} - \frac{4}{242} = \frac{95}{242}\)
