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-5 – [-17 + (15 -6)] + (-15 - 8) – {-1 + (8 - 9) + (7 - 10)} b) -13 – {-4 + [9 + (-5 – 6 + 12) + (-2)] - 5} c) -15 + {-3 – [8 – 4 + (6 - 1)] + 12 – [6 – (5 - 11)]} d) -14 – {-9 – [15 – (16 + 31)] – [-12 + (-8 - 7)]} e) –{4 – 15 – [7 – (3 – 2 - 6) - 8] – [-3 – (7 - 5)]}
 25 jun. 2020

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