Question

a)4 целых 11/15+2целых 7/20;
б)5целых 2/7-4целых11/14

Answer 1

$4 frac{11}{15} +2 frac{7}{20} = frac{71}{15} + frac{47}{20}= frac{284+141}{60} = frac{425}{60}= 7frac{5}{60} =7 frac{1}{12}$
2)  $5 frac{2}{7} -4 frac{11}{14} = frac{37}{7} - frac{67}{14} = frac{74-67}{14} = frac{7}{14} = frac{1}{2}$