Помогите срочно! вычислите: а)3 целых и 3/12+5/12 б)3 целых и 3/12+1 целая и 5/12 в)3...

Решите задачу:

$3 \frac{3}{12} + \frac{5}{12} =3 \frac{8}{12} =3 \frac{2}{3}$
$3 \frac{3}{12} +1 \frac{5}{12} =4 \frac{8}{12} =4 \frac{2}{3}$

$3 \frac{3}{12} + \frac{11}{12} =3 \frac{14}{12} =4 \frac{2}{12} =4 \frac{1}{6}$

$3 \frac{3}{12} +1 \frac{11}{12} =4 \frac{14}{12} =5 \frac{2}{12} =5 \frac{1}{6}$