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0,8supra x-1 e 4supra 5 afla valoarea lui x

Răspuns :

0,8=8/10=4/5
[tex] \frac{ \frac{4}{5} }{x-1} = \frac{4}{5} =\ \textgreater \ \frac{4}{5} (x-1)= \frac{4}{5} =\ \textgreater \ x-1=1 =\ \textgreater \ x=2[/tex]