Вычислите: 1) 2/3 + 3/8; 4) 6/35 + 3/10; 7) 11/48 − 5/36.

1. \(\frac{2}{3}+\frac{3}{8}=\frac{16}{24}+\frac{9}{24}=\frac{25}{24}=1\frac{1}{24}\).
2. \(\frac{6}{35}+\frac{3}{10}=\frac{12}{70}+\frac{21}{70}=\frac{33}{70}\).
3. \(\frac{11}{48}-\frac{5}{36}=\frac{33}{144}-\frac{20}{144}=\frac{13}{144}\).

Ответ: 1) \(1\frac{1}{24}\); 4) \(\frac{33}{70}\); 7) \(\frac{13}{144}\).