3. Выполните: а) $\frac{5}{14}+\frac{6}{21}$; б) $\frac{17}{30}+\frac{11}{70}$; в) $\frac{17}{30}-\frac{11}{70}$; г) $\frac{5}{14}-\frac{6}{21}$; д) $\frac{9}{22}+\frac{9}{121}$; е) $\frac{9}{22}-\frac{9}{121}$.

Question

Вопрос: $Фото задания: 3. Выполните: а) $\frac{5}{14}+\frac{6}{21}$; б) $\frac{17}{30}+\frac{11}{70}$; в) $\frac{17}{30}-\frac{11}{70}$; г)…$ Фото задания

3. Выполните: а) $\frac{5}{14}+\frac{6}{21}$; б) $\frac{17}{30}+\frac{11}{70}$; в) $\frac{17}{30}-\frac{11}{70}$; г) $\frac{5}{14}-\frac{6}{21}$; д) $\frac{9}{22}+\frac{9}{121}$; е) $\frac{9}{22}-\frac{9}{121}$.

Accepted Answer

а) $\frac{5}{14}+\frac{6}{21}=\frac{15}{42}+\frac{12}{42}=\frac{27}{42}=\frac{9}{14}$.

б) $\frac{17}{30}+\frac{11}{70}=\frac{119}{210}+\frac{33}{210}=\frac{152}{210}=\frac{76}{105}$.

в) $\frac{17}{30}-\frac{11}{70}=\frac{119}{210}-\frac{33}{210}=\frac{86}{210}=\frac{43}{105}$.

г) $\frac{5}{14}-\frac{6}{21}=\frac{15}{42}-\frac{12}{42}=\frac{3}{42}=\frac{1}{14}$.

д) $\frac{9}{22}+\frac{9}{121}=\frac{99}{242}+\frac{18}{242}=\frac{117}{242}$.

е) $\frac{9}{22}-\frac{9}{121}=\frac{99}{242}-\frac{18}{242}=\frac{81}{242}$.

3. Выполните: а) \(\frac{5}{14}+\frac{6}{21}\); б) \(\frac{17}{30}+\frac{11}{70}\); в) \(\frac{17}{30}-\frac{11}{70}\); г) \(\frac{5}{14}-\frac{6}{21}\); д) \(\frac{9}{22}+\frac{9}{121}\); е) \(\frac{9}{22}-\frac{9}{121}\).

Ответ: