Question

Вычислите: 9/12 + 11/12; 15/18 - 13/18; 51/60 - 17/60

Answer 1

$displaystyle 1) frac{9}{12}+ frac{11}{12}=frac{9+11}{12}=frac{20}{12}=frac{5}{3}=1frac{2}{3} \\\ 2) frac{15}{18}- frac{13}{18}=frac{15-13}{18}=frac{2}{18}=frac{1}{9} \\\ 3) frac{51}{60}- frac{17}{60}=frac{51-17}{60}=frac{34}{60}=frac{17}{30}$