Найдите значение 2/5+4/15;1/3+1/4;2/3-2/5;1/5-1/6;1/2+1/4.

Решите задачу:

$1)\frac{2}{5}+ \frac{4}{15}= \frac{6+4}{15}= \frac{10}{15}= \frac{2}{3} \\ \\ 2) \frac{1}{3}+ \frac{1}{4}= \frac{4+3}{12}= \frac{7}{12} \\ \\ 3) \frac{2}{3}- \frac{2}{5}= \frac{10-6}{15}= \frac{4}{15} \\ \\ 4) \frac{1}{5}- \frac{1}{6}= \frac{6-5}{30}= \frac{1}{30} \\ \\ 5) \frac{1}{2}+ \frac{1}{4}= \frac{4+2}{8}= \frac{6}{8}= \frac{3}{4}$