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20. Calculaţi: a) 10² [(3¹⁷+2-3¹⁷)²:27¹¹ +45°)]; c) [344: (3¹0 +3 10+ 310)4+70151 : 250, 10 L b) [(6-510-510)3:25¹5 - 47°1-10³; d) 277: [(2¹3 +2¹3 +2¹4)³: 647 +1110​