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a) [(1³+3²-2³). 5²-7²]-8²-26; b) (18: 18² - 17:17 +15:5) 2²-3²; c) {[(20-9): (25-3)²+28°]:5}; d) 742-3²-{446-2³ [271-52 (3-3:30:31=pulaaa​