(117 O 17) O 25 = 4
(235 O 45) O 7 = 40
52 O 26 O 2 = 0
45 O 15 O 3 = 50
(117 − 17) : 25 = 4
(235 + 45) : 7 = 40
52 : 26 : 2 = 0
45 + 15 : 3 = 50
Проверка:
$(117 \overset{1}{-} 17) \overset{2}{:} 25 = 4$
1) 117 − 17 = 100
2) 100 : 25 = 4
$(235 \overset{1}{+} 45) \overset{2}{:} 7 = 40$
1) 235 + 45 = 280
2) 280 : 7 = 40
$52 \overset{1}{:} 26 \overset{2}{:} 2 = 0$
1) 52 : 26 = 2
2) 2 : 2 = 1
$45 \overset{2}{+} 15 \overset{1}{:} 3 = 50$
1) 15 : 3 = 5
2) 45 + 5 = 50