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Prawdziwki = 5 kg - 3 kg = 1 kg
Razem = 5 kg + 1 kg = 7 kg
Prawdziwki:
5 1/4 kg - 3 2/5 kg =
21/4 - 17/5 =
105/20 - 68/20 = 37/20 = 1 17/20 kg
Suma:
1 17/20 kg + 5 1/4 kg = 1 17/20 kg + 5 5/20 kg = 6 22/20 kg = 7 2/20 kg = 7 1/10 kg