66. 84-(36+24): 3 * 2; 187-(87-40-17)*2; (85-53)-(28+16):4; 271*3; 408*2; 129*4; 28:4*12; 48:8*13; 35:5*14

Решение:

1. 84 - (36 + 24) : 3 * 2 = 84 - 60 : 3 * 2 = 84 - 20 * 2 = 84 - 40 = 44
2. 187 - (87 - 40 - 17) * 2 = 187 - (47 - 17) * 2 = 187 - 30 * 2 = 187 - 60 = 127
3. (85 - 53) - (28 + 16) : 4 = 32 - 44 : 4 = 32 - 11 = 21
4. 271 * 3 = 813
5. 408 * 2 = 816
6. 129 * 4 = 516
7. 28 : 4 * 12 = 7 * 12 = 84
8. 48 : 8 * 13 = 6 * 13 = 78
9. 35 : 5 * 14 = 7 * 14 = 98