Răspuns:
[tex]$\mathbf{x =\pm \frac{5}{ 3} }$[/tex]
Explicație pas cu pas:
[tex]$\mathbf{d) \: {x}^{2} = 0.2(7) }$[/tex]
[tex]$\mathbf{0.2(7) = \frac{27 - 2}{9} = \frac{25}{9} }$[/tex]
[tex]$\mathbf{ {x}^{2} = \frac{25}{9} \Longleftrightarrow \: x =\pm \sqrt{ \frac{25}{9} }\Longleftrightarrow \: x =\pm \frac{5}{3} }$[/tex]
[tex]$\mathbf{\Longrightarrow \: S = \left\{ - \frac{5}{3}; \frac{5}{3} \right\}}$[/tex]
Bafta!
