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

Выполним вычисления по действиям:

1. 84 - (36 + 24) : 3 * 2 = 84 - 60 : 3 * 2 = 84 - 20 * 2 = 84 - 40 = 44
2. 187 - (87 - 40 - 17) * 2 = 187 - (87 - 57) * 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