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Efectuează: a) (4⁰ +4¹ +4²)5:214+ 21⁰; b) [62024:361010+ (511)3:25¹5 - 2023°] - [(35)4: 98 +12026]; c) 624:623.6-(254)5:53⁹; d) [(11-02023). (33-3²) + 12025]. (32-2³) -3².2.​