80-16*5 = 90: (6*15) = 78: (13-7) * 0 = 70+2*12 = 68: (72:18) = 64: (39-7) * 1=

1) 80 - 16 * 5 = 80 - (10 * 5 + 6 * 5) = 80 - (50 + 30) = 80 - 50 - 30 = 30 - 30 = 0;

2) 90 : (6 * 15) = 90 / (6 * 10 + 6 * 5) = 90 / (60 + 30) = 90 / 90 = 1 / 1 = 1;

3) 78 : (13 - 7) * 0 = 78 / 6 * 0 = 13 * 0 = 0;

4) 70 + 2 * 12 = 70 + 2 * 10 + 2 * 2 = 70 + 20 + 4 = 90 + 4 = 94;

5) 68 : (72 : 18) = 68 / 4 = 17;

6) 64 : (39 - 7) * 1 = 64 / 32 * 1 = 2 * 1 = 2.