400 : (230 − 190) * 8 = 80
600 : (780 − 680) * 9 = 54
36000 : 1000 : 4 = 9

Вычисления:
$400 \overset{2}{:} (230 \overset{1}{-} 190) \overset{3}{*} 8 = 80$
1) 230 − 190 = 40
2) 400 : 40 = 10
3) 10 * 8 = 80
 
$600 \overset{2}{:} (780 \overset{1}{-} 680) \overset{3}{*} 9 = 54$
1) 780 − 680 = 100
2) 600 : 100 = 6
3) 6 * 9 = 54
 
$36000 \overset{1}{:} 1000 \overset{2}{:} 4 = 9$
1) 36000 : 1000 = 36
2) 36 : 4 = 9