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Aflati x,y,z , stiind ca sunt direct proportionale cu numerele 0,1; 2pe 5; 1pe 3 ; si ca suma lor este 1 .

Răspuns :

[tex]\frac{x}{ \frac{1}{10} } = \frac{y}{ \frac{2}{5} } = \frac{z}{ \frac{1}{3} }=k[/tex]
[tex]\frac{x}{ \frac{1}{10} }=10x[/tex]
[tex]\frac{y}{ \frac{2}{5} }= \frac{5y}{2} [/tex]
[tex]\frac{z}{ \frac{1}{3} }=3z[/tex] 
[tex]10x=k \\ x= \frac{k}{10} \\ \\ \frac{5y}{2} =k \\ y= \frac{2k}{5} \\ \\ 3z=k \\ z= \frac{k}{3 }[/tex]
[tex]\frac{k}{10}+\frac{2k}{5}+\frac{k}{3} =1 \\ \frac{25k}{30} =1 \\ 25k=30 \\ k=30/25= \frac{6}{5} [/tex]
[tex]x= \frac{5}{60} \\ \\ y= \frac{12}{25} \\ \\ z= \frac{6}{15} [/tex]