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25 + 345=370 102 + 578=680
asociativa: (45 + 45 ) + 155 = 245 (120 + 180) + 90 = 390
(155 + 45) + 45 = 245 (180 + 90) + 120 = 390
elemento neutro: 12.987 + 0 = 0 1´987.654 + 0 = 0
0 + 12.987 = 0 0 + 1´987.654 = 0