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1. 10 - (6 - 15 + 7 - 20) = 10 - 6 + 15 - 7 + 20 = 32
2. -9 -(14 + 16 - 5) = -9 - (25) = -9 - 25 = -34
3. 50 - (-25) = 50 + 25 = 75
4. -145 + 25 - (10 + 6) = -120 - 16 = -136
5. 500 - (-78 + 25) = 500 - (-53) = 553
6. 26 + 6 + 10 - (-78) = 26 + 6 + 10 + 78 = 120
7. 13 - (-7) = 13 + 7 = 20
8. 25 + 25 - (-25) = 50 + 25 = 75
9. 10 - (10 - 20 + 5) = 10 - 10 + 20 - 5 = 15
10. 27 + 3 - (9 + 9) = 30 - 18 = 12
*NOTA:
- × - = +
- × + = -
+ × + = +