Условие:

65830;
7458;
29 + 7 + 11;
38 + 26 + 2;
(76 + 8) − 6;
30 − (7 + 8).

65830 = 5730 = 27;
7458 = 698 = 61;
29 + 7 + 11 = (29 + 11) + 7 = 40 + 7 = 47;
38 + 26 + 2 = (38 + 2) + 26 = 40 + 26 = 66;
(76 + 8) − 6 = (766) + 8 = 70 + 8 = 78;
30 − (7 + 8) = 3015 = 15.