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Trei-ul, vă rog frumos!!!


Treiul Vă Rog Frumos class=

Răspuns :

{x, y, z} i.p {2, 4, 8}=>

=>[tex]\frac{x}{\frac{1}{2} }[/tex]=[tex]\frac{y}{\frac{1}{4} }[/tex]=[tex]\frac{z}{\frac{1}{8} }[/tex]=k=>x=[tex]\frac{1}{2}[/tex]k; y=[tex]\frac{1}{4}[/tex]k; z=[tex]\frac{1}{8}[/tex]k

x+y+z=14=>

=>[tex]\frac{1}{2}[/tex]k+[tex]\frac{1}{4}[/tex]k+[tex]\frac{1}{8}[/tex]k=14

aducem la acelasi numitor, deci:

[tex]\frac{8k+4k+2k}{16}[/tex]=14

14k=14·16=>

=>k=[tex]\frac{14x16}{14}[/tex]

k=16

de aici calculam x, y, z

x=[tex]\frac{1}{2}[/tex]·16=>x=8

y=[tex]\frac{1}{4}[/tex]·16=>y=4

z=[tex]\frac{1}{8}[/tex]·16=>z=2