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aflati x:1 pe 10<10 pe x<1 pe 9
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Răspuns :

[tex] \frac{1}{10} < \frac{10}{x} < \frac{1}{9} \\ \\ \frac{10}{100} < \frac{10}{x} < \frac{10}{90} \\ \\ 100 < x < 90 \\ \\ \\ x = 91.92.93.94.95.96.97.98.99[/tex]