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35 Calculați: a 1 · (−1)¹ + 2 ⋅ (−1)² + 3 ⋅ (−1)³ + ... + 250 · (−1) la puterea 250
b (−1)¹× (−1)²×(-1)³×... ×(-1)la puterea 250
va rog cat mai repede​