[tex](-1\frac{1}{4})^{-2}=(-\frac{5}{4})^{-2}=(-\frac{4}{5})^2=\frac{16}{25}\\\\(-1\frac{1}{4})^{-3}=(-\frac{5}{4})^{-3}=(-\frac{4}{5})^3=-\frac{64}{125}[/tex]
