77 + 28 : 7 * 5 = 97
18 * 3 + (74 + 22) : 16 = 60
97 − (72 : 12 + 50) : 8 = 90

Вычисления:
$77 \overset{3}{+} 28 \overset{1}{:} 7 \overset{2}{*} 5 = 97$
1) 28 : 7 = 4
2) 4 * 5 = 20
3) 77 + 20 = 97
 
$18 \overset{2}{*} 3 \overset{4}{+} (74 \overset{1}{+} 22) \overset{3}{:} 16 = 60$
1) 74 + 22 = 96
2) 18 * 3 = (10 + 8) * 3 = 10 * 3 + 8 * 3 = 30 + 24 = 54
3) 96 : 16 = 6
4) 54 + 6 = 60
 
$97 \overset{4}{-} (72 \overset{1}{:} 12 \overset{2}{+} 50) \overset{3}{:} 8 = 90$
1) 72 : 12 = 6
2) 6 + 50 = 56
3) 56 : 8 = 7
4) 97 − 7 = 90