Question

Exercitiul 5/Pagina 32.Matematica clasa a VIII-a.Editura Teora

Answer 1

[tex]Stim \ ca\ \frac{1}{a} \leq -0,4 \ \textless \ 0 =\ \textgreater \ a\ \textless \ 0\ (1) \\ \frac{1}{a}\leq-0,4 =\ \textgreater \ a \geq -\frac{1}{0,4} =\ \textgreater \ a\geq (-1)*\frac{10}{4} =\ \textgreater \ a\geq \frac{-5}{2} =\ \textgreater \ \\ =\ \textgreater \ a \geq -2,5 \ (2) \\ Mai \ stim \ ca \ a \in \mathbb R => din (1),(2) \ si \ a \in \mathbb R\ \textgreater \ -2,5\leq a \ \textless \ 0 =\ \textgreater \ a \in [-2,5;0)[/tex]