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Sa se afle x,y,z daca sunt invers proportionale cu 2,3,4 iar suma lor este 13
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Răspuns :

[tex]\{x,y,z\} i.p.\{2,3,4\}\Rightarrow \dfrac{x}{\frac{1}{2}}=\dfrac{y}{\frac{1}{3}}=\dfrac{z}{\frac{1}{4}}=k\Rightarrow x=\dfrac{k}{2},y=\dfrac{k}{3},z=\dfrac{k}{4}\\ x+y+z=13\\ \dfrac{k}{2}+\dfrac{k}{3}+\dfrac{k}{4}=13|\cdot 12\\ 6k+4k+3k=13\cdot 12\\ 13k=13\cdot 12\Rightarrow \boxed{k=12}\\ x=\dfrac{k}{2}\Rightarrow \boxed{x=6}\\ y=\dfrac{k}{3}\Rightarrow \boxed{y=4}\\ z=\dfrac{k}{4}\Rightarrow \boxed{z=3}[/tex]