Răspunsuri

  • Utilizator Brainly
2014-02-28T18:33:32+02:00
Trebuie sa te joci cu proprietatile proportiilor: x/y=7/9 ⇒ 5x/y=35/9 ⇒ 5x/2y=35/18 ⇒ 
5x+2y/2y=53/18;
x/y=7/9 ⇒ 2x/y=14/9 ⇒ 2x-y/y=5/9 ⇒ 2x-y/2y=5/18;
Din cele doua relatii impartite: 5x+2y/2x-y=53/5.
[tex] \frac{x}{y}= \frac{7}{9} \frac{5x+2y}{2x-y}=? \frac{x}{y}= \frac{7}{9}⇒ \frac{5* \frac{7y}{9}+2y }{2* \frac{7y}{9}-y } = \frac{ \frac{35y}{9}+ \frac{18y}{9} }{ \frac{14y}{9}- \frac{9y}{9} }= \frac{ \frac{53y}{9} }{ \frac{5y}{9}}= \frac{53y}{9}* \frac{9}{5y}= \frac{53y}{5y} = \frac{53}{5} [/tex]
copiaz-o undeva sa vezi cam cum se facea.. am reusit.. ms oricum
copiaz-o acolo unde pui intrebare sa vezi cum era..