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f) (-12)-(-11) = -12 +11 = -1
g) (-28)-(+42)-(-23) = -28 - 42 +23 =-28-19 = -47
h) (-15) -(-6)-(-23) = -15+6+23 = -15+29 = 14
i) (+45)-(-4)-(+17) = 45 +4 -17 = 49-17 = 32
Espero que te sirva la solución