Частина 2. Номер 480

42 + (57 + 23) : 5 = 58
1) 57 + 23 = 80
2) 80 : 5 = 16
3) 42 + 16 = 58

72 : 3 + (58 – 36) : 2 = 35
1) 58 – 36 = 22
2) 72 : 3 = 24
3) 22 : 2 = 11
4) 24 + 11 = 35

18 · 3 + 11 · 4 = 54 + 44 = 98

90 – 15 · 3 : 5 = 81
1) 15 · 3 = 45
2) 45 : 5 = 9
3) 90 – 9 = 81

140 + 510 : 3 = 140 + 170 = 310

700 – (210 + 370) = 700 – 580 = 120