fie
[tex] 2^{ \sqrt{x} } =t,t\ \textgreater \ 0 \\ t^{2}-9t+8\ \textless \ 0 \\ t:apatine(1;8) \\ revenim \\ 2^{ \sqrt{x} } \ \textless \ 8 si 2^{ \sqrt{x} }\ \textgreater \ 1 \\ \sqrt{x} \ \textless \ 3si \sqrt{x} \ \textgreater \ 0 \\ \\ x\ \textless \ 9six\ \textgreater \ 0 \\ [/tex]
x∈(0;9)
