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4. Calculaţi: a) [(1³+3²-2³) 5²-721-8²-25; b) (18³: 18² - 17:17 +15:5) 2²-3²; c) {[(2¹⁰.9): (25-3°)² +28°]:5}"; d) 742-3² (446-2 [271-5² (37-3": 3:3'))​