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Aflati x din proportiile : 2/1/5 =20/x

Răspuns :

[tex]\sf \frac{2}{\frac{1}{5}}= \frac{20}{x} \\ \\ 2*5= \frac{20}{x} \\ \\ \frac{20}{x}=10 \\ \\x= \frac{20}{10} \\ \\ \boxed{\sf x=2} [/tex]
2/1/5=20/x<=>10=20/x=>x=2