а)1800:6+600*60=300+36000=36300
б)(5000-509)-999=4491-999=3492
в)35000*2:100=70000:100=700
г)(8400-8200)*20=200*20=4000
д)(10200+16000):20=26200:20=1310
(1800:6)+(600х60)=300+36000=36300
(5000-509) - 999= 4491-999=3492
(35000х2):100= 700
(8400-8200)х20=4000
(10200+16000):20=1310