Примеры: 42000: 70-18000: 900= 8100: 900+3200: 400= 600000-605*20: 100= 4729-319*4+902= 3830+645: 5-1989= решайте! удачи и поскорей!

1)580
2)14
3)599879
4)4355
5)1970

(42000/70) - (18000/900) = 600 - 20 = 580
(8100/900) + (3200/400) = 9 + 8 = 17
600000 - (605*20/100) = 600000 - 121 = 599879
4729-(319*4) +902 = 4729-1276+902 = 4355
3830 + (645/5) -1989 = 3830 + 129 -1989 = 1970