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Bia444
a fost răspuns

Daca x supra y = 3 supra 7, calculeaza 5x + 7y supra 9x - 3y.

Ajutor ! :)

Răspuns :

Tall12
x/y=3/7;(5x+7y)/(9x-3y)
x/y=3/7
x/3=y/7=k⇒x=3k,y=7k
(5·3k+7·7k)/(9·3k-3·7k)
(15k+49k)/(27k-21k)=64k/6k=64/6=32/3