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Numerele 3,x,5 sund direct proportionale cu y,54.45.Calculati x+y si y-x.

Răspuns :

3/y=x/54=5/45=1/9 ⇒ 3/y=1/9, y=27; x/54=1/9 ⇒ x=6; x+y=33, y-x=21