85 − 60 + 9;
71 + 19 − 8;
52 + (13 + 7);
52 − (13 + 7);
14 + 86;
100 − 12.
85 − 60 + 9 = 25 + 9 = 34;
71 + 19 − 8 = 90 − 8 = 82;
52 + (13 + 7) = 52 + 20 = 72;
52 − (13 + 7) = 52 − 20 = 32;
14 + 86 = (10 + 80) + (4 + 6) = 90 + 10 = 100;
100 − 12 = 88.