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Completează cu semnul potrivit: 2/3 [] 4/3, 1/5 [] 2/10, 1/2 [] 3/4, 5/4 [] 1/4, 2/6 [] 2/3, 4/10 [] 40/1000, 2/10 [] 23/10, 3/2 [] 2/4, 5/2 [] 4/3.