POR FAVOR AJUDEM!
Resolva estas expressões:
a) 5 + (2 - 6)
b) - 15 - (- 23 + 12)
c) (9 - 15) + (12 - 20)
d) (-9 + 5) - (- 6 - 8 - 4)
e) - (-2) + (-3) - { - 2 + [ - 1 - (- 2 + 1)] + 5}
f) 20 - { - 10 - [ - 8 + (5 - 12)] - 20}


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