2. Выполните действия (Вариант 1): 1) 1/6 + 15/19 - 13/19; 2) 6 5/27 + 4 12/27; 3) 1 - 9/17; 4) 9 3/12 - 5 1/2.

1) \( \frac{1}{6} + \frac{15}{19} - \frac{13}{19} = \frac{1}{6} + \frac{2}{19} = \frac{19 + 12}{114} = \frac{31}{114} \) 2) \( 6 \frac{5}{27} + 4 \frac{12}{27} = 10 \frac{17}{27} \) 3) \( 1 - \frac{9}{17} = \frac{17}{17} - \frac{9}{17} = \frac{8}{17} \) 4) \( 9 \frac{3}{12} - 5 \frac{1}{2} = 9 \frac{1}{4} - 5 \frac{1}{2} = 9 \frac{1}{4} - 5 \frac{2}{4} = 8 \frac{5}{4} - 5 \frac{2}{4} = 3 \frac{3}{4} \)