278 + 12 * 10 = 278 + 120 = 398
465 - 60 * 1 = 465 - 60 = 405
894 - (2 * 100 + 4 * 1) = 894 - 204 = 690
110 - (10 * 10 + 9 * 1) = 110 - 109 = 1
278 + 12 * 10 = 278 + 120 = 398
465 - 60 * 1 = 465 - 60 = 405
894 - (2 * 100 + 4 * 1) = 894 - 204 = 690
110 - (10 * 10 + 9 * 1) = 110 - 109 = 1