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8-1 b). 2¹8:2¹7-2¹; c). (7³): (74)6; (2³-34-76)³: d) (37.58) 5 (38.5¹0 )4; e). 647:328: 1259 : 25¹3; (24.35.79 )²; 328: 16⁹; 2713 :918; 129:85:94;​