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1.Stiind ca 2x+5y supra 5y= 13 supra 10, Calculati x supra y.
2. Stiind ca:
a) a supra 0,2=0,24 supra b, Calculati 1000 ab,
b) x supra y= z supra t, Calculati 11-xt supra yz.


Răspuns :

[tex] \frac{2x+5y}{5y} [/tex]=[tex] \frac{13}{10} [/tex] ⇒2x/5y+1=13/10                     ⇒2x/5y=13/10-1⇒2x/5y=3/10⇒x/y=3/10*5/2=3/4