$72 \overset{1}{:} 12 \overset{2}{*} 9 = 54$
$4 \overset{1}{*} 15 \overset{2}{:} 10 = 6$
$96 \overset{1}{:} 12 \overset{2}{:} 8 = 1$
$540 \overset{3}{-} (68 \overset{1}{-} 5) \overset{2}{:} 7 = 531$
$(930 \overset{2}{-} 14 \overset{1}{*} 5) \overset{3}{:} 10 = 86$
$(120 \overset{1}{-} 80) \overset{3}{:} (48 \overset{2}{:} 6) = 5$

Вычисления:
$72 \overset{1}{:} 12 \overset{2}{*} 9 = 54$
1) 72 : 12 = 6
2) 6 * 9 = 54
 
$4 \overset{1}{*} 15 \overset{2}{:} 10 = 6$
1) 4 * 15 = 4 * (10 + 5) = 4 * 10 + 4 * 5 = 40 + 20 = 60
2) 60 : 10 = 6
 
$96 \overset{1}{:} 12 \overset{2}{:} 8 = 1$
1) 96 : 12 = 8
2) 8 : 8 = 1
 
$540 \overset{3}{-} (68 \overset{1}{-} 5) \overset{2}{:} 7 = 531$
1) 68 − 5 = 63
2) 63 : 7 = 9
3) 540 − 9 = 531
 
$(930 \overset{2}{-} 14 \overset{1}{*} 5) \overset{3}{:} 10 = 86$
1) 14 * 5 = (10 + 4) * 5 = 10 * 5 + 4 * 5 = 50 + 20 = 70
2) 930 − 70 = 860
3) 860 : 10 = 86
 
$(120 \overset{1}{-} 80) \overset{3}{:} (48 \overset{2}{:} 6) = 5$
1) 120 − 80 = 40
2) 48 : 6 = 8
3) 40 : 8 = 5