October 2018 2 20 Report
Quita los paréntesis y calcula:
a) 5 + 4 – 9 – (– 8 + 5)
b) – 7 + 4 – 7 – (8 – 4 + 3)
c) – 6 – [2 – (1 + 5)] – (– 3 + 1)
d) 2 + 2 + 3 – [2 – (– 3)]
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