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Doi la puterea X plus unu mai mic sau egal cu 16

Răspuns :

[tex]2^{x+1} \leq 16 \ \textless \ =\ \textgreater \ 2^{x+1} \ \leq 2^4 \ \textless \ =\ \textgreater \ x+1 \leq 4 \ \textless \ =\ \textgreater \ x \leq 3;[/tex]
x ∈(-∞;3]