1. [tex] (\frac{2}{3}) ^{-1} = \frac{3}{2} = 1,5[/tex]
2. [tex] ( \frac{2}{3} )^{-2} = (\frac{3}{2}) ^{2} = \frac{ 3^{2} }{2 ^{2} } = \frac{9}{4}=2,25 [/tex]
3. [tex] ( \frac{-1}{3} )^{-2} = ( \frac{3}{-1} )^{2} = \frac{9}{1} =9[/tex]
4.[tex] ( \frac{-1}{3} )^{-3} = ( \frac{3}{-1} )^{3} = \frac{27}{-1} =-17[/tex]
