May 2021 1 194 Report
Realiza las siguientes operaciones combinadas.

1) 450 - {6 + [4 - (3 - 1)]}

2) 520 + {8 - 3 + [9 - (4 + 2 - 1)]}

3) (150 - 5) - {14 + (9 - 6 + 3)}
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