1) (4869484:1621+59058:18):(7560:504) = (3002 + 3281):(15) = 6283:15 = 418.87
2) 31440 + 1040:(150 - 2400:(67+53)) 20 = 31440 + 1040:(150 - 2400:120) 20= 31440 + 1040:(150 - 20) 20= 31440 + 1040:130 20= 31440 + 8 * 20= 31440 + 160= 31600
1) (4869484:1621+59058:18):(7560:504) = (3002 + 3281):(15) = 6283:15 = 418.87
2) 31440 + 1040:(150 - 2400:(67+53)) 20 = 31440 + 1040:(150 - 2400:120) 20
= 31440 + 1040:(150 - 20) 20
= 31440 + 1040:130 20
= 31440 + 8 * 20
= 31440 + 160
= 31600