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Calculati numerele x,y,z stiind ca x pe 11 = y pe 9= z pe 3 si x pe 11+y pe 9+z pe 3=18

Răspuns :

[tex] \frac{x}{11}= \frac{y}{9}= \frac{z}{3} 
[tex] \frac{x}{11} + \frac{y}{9} + \frac{z}{3} = 18 [/tex]
⇒ [tex] \frac{x}{11} + \frac{x}{11} + \frac{x}{11} = 18[/tex]
[tex] \frac{3x}{11} = 18[/tex]
3x=11x18
3x=198
x=66 ⇒ [tex]y= \frac{9x}{11} [/tex] ⇒y= 54
[tex]z= \frac{3x}{11} [/tex] ⇒ z=18
[tex] \frac{x}{11}= \frac{y}{9} =\frac{z}{3}=k . \\ \\ \frac{x}{11}+ \frac{y}{9}+ \frac{z}{3}=18<=>3k=18=>k=6. \\ \\ \frac{x}{11}= \frac{y}{9}= \frac{z}{3}=6. \\ \\ \frac{x}{11}=6=>x=66. \\ \\ \frac{y}{9}=6=>y=54. \\ \\ \frac{z}{3}=6=>z=18. [/tex]