Ответ:
- \(\frac{1}{4}+\frac{2}{4}=\frac{1+2}{4}=\frac{3}{4}\).
- \(\frac{7}{12}-\frac{2}{12}=\frac{7-2}{12}=\frac{5}{12}\).
- \(\frac{3}{9}+\frac{5}{9}=\frac{3+5}{9}=\frac{8}{9}\).
- \(\frac{6}{8}-\frac{5}{8}=\frac{6-5}{8}=\frac{1}{8}\).
- \(\frac{4}{11}+\frac{6}{11}=\frac{4+6}{11}=\frac{10}{11}\).
Ответ: а) \(\frac{3}{4}\); б) \(\frac{5}{12}\); в) \(\frac{8}{9}\); г) \(\frac{1}{8}\); д) \(\frac{10}{11}\).
