Выполните сложение и вычислите: 1. 1 2/5 + 3 2/5 =; 2. 3 2/7 + 6 4/7 =; 3. 2 2/9 + 9 5/9 =; 4. 12 4/11 + 3 5/11 =; 5. 8 9/17 + 7 6/17 =; 6. 6 8/19 + 3 9/19 =; 7. 16 7/15 + 6 9/15 =.

1. \(1\frac{2}{5}+3\frac{2}{5}=(1+3)+\frac{2+2}{5}=4\frac{4}{5}\).
2. \(3\frac{2}{7}+6\frac{4}{7}=(3+6)+\frac{2+4}{7}=9\frac{6}{7}\).
3. \(2\frac{2}{9}+9\frac{5}{9}=(2+9)+\frac{2+5}{9}=11\frac{7}{9}\).
4. \(12\frac{4}{11}+3\frac{5}{11}=(12+3)+\frac{4+5}{11}=15\frac{9}{11}\).
5. \(8\frac{9}{17}+7\frac{6}{17}=(8+7)+\frac{9+6}{17}=15\frac{15}{17}\).
6. \(6\frac{8}{19}+3\frac{9}{19}=(6+3)+\frac{8+9}{19}=9\frac{17}{19}\).
7. \(16\frac{7}{15}+6\frac{9}{15}=22\frac{16}{15}=23\frac{1}{15}\).

Ответ: 1) \(4\frac{4}{5}\); 2) \(9\frac{6}{7}\); 3) \(11\frac{7}{9}\); 4) \(15\frac{9}{11}\); 5) \(15\frac{15}{17}\); 6) \(9\frac{17}{19}\); 7) \(23\frac{1}{15}\).