Explicación paso a paso:
11 - (12 - 8) = 11 - 12 + 8
11 - (4) = - 1 + 8
11 - 4 = - 1 + 8
7 = 7
El a es correcto
[(-12) + 9 ] - 5 = (-12) + 9 - 5
- 12 + 9 - 5 = - 12 + 9 - 5
- 3 - 5 = - 3 - 5
- 8 = - 8
El b es correcto
- (8-6) - 10 = (-8) - 6 + 10
- 2 - 10 = -14 + 10
- 12 = - 4
El c no es correcto
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Explicación paso a paso:
11 - (12 - 8) = 11 - 12 + 8
11 - (4) = - 1 + 8
11 - 4 = - 1 + 8
7 = 7
El a es correcto
[(-12) + 9 ] - 5 = (-12) + 9 - 5
- 12 + 9 - 5 = - 12 + 9 - 5
- 3 - 5 = - 3 - 5
- 8 = - 8
El b es correcto
- (8-6) - 10 = (-8) - 6 + 10
- 2 - 10 = -14 + 10
- 12 = - 4
El c no es correcto