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81:(18:x)=9


Răspuns :

18:x=81:9
18:x=9
x=18:9
x=2
81:(18:x)=9
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[tex]\it \dfrac{81}{\dfrac{18}{x}}= \dfrac{9}{1} \Rightarrow \dfrac{18}{x} = \dfrac{81}{9} \Rightarrow \dfrac{18}{x} = 9 \Rightarrow x = 2\ . [/tex]