Выполни действия : 2/9+5/9; 42/64-27/64; a/n+b/n; 8/11-3/11; 19/75+35/75; x/k-y/k

2/9+5/9 = (2+5)/9 = 7/9 = $\frac{7}{9}$
$42/64-27/64 = (42-27)/64 = 15/64 = \frac{15}{64}$
$a/n+b/n = (a+b)/n = \frac{a+b}{n}$
$8/11-3/11 = (8-3)/11 = 5/11 = \frac{5}{11}$
$19/75+35/75 = (19+35)/75 = 54/75 = \frac{54}{75}$
$x/k-y/k = (x-y)/k = \frac{x-y}{k}$
Распределительный закон умножения, детка!