выполните сложение дробей: 2) 2/5 +7/15; 4) 2/7+1/3; 6) 5/6+7/8; 8) 5/18+2/3;

[tex]2) \frac{2}{5} + \frac{7}{15} = \frac{6}{15} + \frac{7}{15} = \frac{13}{15} [/tex]
[tex]4) \frac{2}{7} + \frac{1}{3} = \frac{6}{21} + \frac{7}{21} = \frac{13}{21} [/tex]
[tex]6) \frac{5}{6} + \frac{7}{8} = \frac{20}{24} + \frac{21}{24} = \frac{41}{24} =1 \frac{17}{24} [/tex]
[tex]8) \frac{5}{18} + \frac{2}{3} = \frac{5}{18} + \frac{12}{18} = \frac{17}{18} [/tex]