1800 : (600 − 250 * 2)
1400 : (800 − 600) * 90
1800 : (600 − 250 * 2) = 18
1400 : (800 − 600) * 90 = 630
Вычисления:
$1800 \overset{3}{:} (600 \overset{2}{-} 250 \overset{1}{*} 2) = 18$
1) 250 * 2 = 500
2) 600 − 500 = 100
3) 1800 : 100 = 18
$1400 \overset{2}{:} (800 \overset{1}{-} 600) \overset{3}{*} 90 = 630$
1) 800 − 600 = 200
2) 1400 : 200 = 7
3) 7 * 90 = 630