Приведите дроби к общему знаменателю.решение.2/15и5/12; 5/12и7/8; 6/15и11/18; 5/16и5/12.

$\frac{2}{15} + \frac{5}{12} = \frac{8+25}{60} = \frac{33}{60} = \frac{11}{20}$ .
$\frac{5}{12} + \frac{7}{8} = \frac{10+21}{24} = \frac{31}{24} = 1 \frac{7}{24} .$
$\frac{6}{15} + \frac{11}{18} = \frac{36+55}{90} = \frac{91}{90} = 1 \frac{1}{90} .$
$\frac{5}{16} + \frac{5}{12} = \frac{15+20}{48} = \frac{35}{48}.$