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Aflati un nr care inmultit cu2/5 da acelasi rezultat ca atunci cand scadem1/4.

Răspuns :

x × 2/5 =x-1/4
2x/5=x-1/4
8x=20x-5
12x=5
x=5/12

verificare
5/12 × 2/5= 2/12=1/6
5/12-1/4=(5-3)/12=2/12=1/6