д) 1/6 + 1/12; е) 2/3 − 4/27; ж) 23/25 + 4/5; з) 29/60 − 7/30

1. \(\frac{1}{6}+\frac{1}{12}=\frac{2}{12}+\frac{1}{12}=\frac{3}{12}=\frac{1}{4}\).
2. \(\frac{2}{3}-\frac{4}{27}=\frac{18}{27}-\frac{4}{27}=\frac{14}{27}\).
3. \(\frac{23}{25}+\frac{4}{5}=\frac{23}{25}+\frac{20}{25}=\frac{43}{25}=1\frac{18}{25}\).
4. \(\frac{29}{60}-\frac{7}{30}=\frac{29}{60}-\frac{14}{60}=\frac{15}{60}=\frac{1}{4}\).

Ответ: д) \(\frac{1}{4}\); е) \(\frac{14}{27}\); ж) \(\frac{43}{25}=1\frac{18}{25}\); з) \(\frac{1}{4}\).