Условие:

80 − (246)
90 − (368)
48 + (13 + 7)
34 + (18 + 2)
89 − (644)
75 − (377)

80 − (246) = 8018 = 62;
90 − (368) = 9028 = 62;
48 + (13 + 7) = 48 + 20 = 68;
34 + (18 + 2) = 34 + 20 = 54;
89 − (644) = 8960 = 29;
75 − (377) = 7530 = 45.