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1 1/4 + 13/20 = 25/20 + 13/20 = 38/20 = 1 18/20 = 1 9/10
Odp: Chłopcy łącznie kupili 1 9/10 kg orzechów
1 1/4 + 13/20 = 5/4 +13/20 = 25/20 + 13/20 = 38/20 = 1 18/20 = 1 9/10