Răspuns:
1. [tex]\frac{256}{625}[/tex]
2. [tex]\frac{4096}{15625}[/tex]
Explicație pas cu pas:
1. [tex](-\frac{5}{4})^{-2} : (-\frac{5}{4})^{-6} = \frac{1}{(-\frac{5}{4})^{2}} : \frac{1}{(-\frac{5}{4})^{6}} = (-\frac{4}{5})^{2} : (-\frac{4}{5})^{6} = \frac{(\frac{4}{5})^{2}}{(\frac{4}{5})^{6}} = \frac{1}{(\frac{4}{5})^{4}} = (\frac{5}{4})^{4} = \frac{625}{256}[/tex]
⇒ inversul este = [tex]\frac{256}{625}[/tex]
2. [tex][(-\frac{5}{4} )^{2} ]^{3} = (-\frac{5}{4} )^{2*3} = (-\frac{5}{4} )^{6} = (\frac{5}{4} )^{6} = \frac{5^{6}}{4^{6} } = \frac{15625}{4096}[/tex]
⇒ inversul este = [tex]\frac{4096}{15625}[/tex]