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doi supra cinci minus unu supra doi

Răspuns :

2/5 - 1/2=2/5 - 2/4= calculeaza tu
2/5=4/10  si 1/2=5/10 (am adus la numitor comun !)

2/5 - 1/2 = 4/10 - 5/10 = (4-5)/10 = -1/10 = - 0,1