(15*(178+5)+90)*7 = (15*183+90)*7 = (2745+90)*7 = 2835*7 = 19845
486:9*(46+54):10 = 54*100:10 = 540
624268 - 13965 + 190008 = 610303 + 190008 = 800311
105 * (6+203) - 300 : 5= 105*209 - 60 = 21945 - 60 = 21885
(6275 - 1823) * 0 + 3500 = 3500
и в последнем ответ 10000