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21 Calculați: a (4+8+12+16+...+4000): b (4+8+12+16+...+8000): c (6+12+18+24+...+600)2 22 Comparati numerologi (2+4+6+8+...+2000)+(2011+37):2¹0; (2+4+6+8+...+4000)+(253 +252 +251): (217)³; : (3+6+9+12+...+300): (1+2+3+...+100).​

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