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1 Calculează: a) 500 606:25 = 6780:60 = 768 645: 15 = b) 637:35 = 4747:47 = 999 998: 99 = 4 221:21= 12 999:99 = c) 3 003:30 = 30 030:30 = 550 550:55 = 879 423:79= 79 300:97=​