Răspuns :
[tex]a) \: ( \frac{2}{3} ) {}^{4} = \frac{2 {}^{4} }{3 {}^{4} } = \frac{16}{81} \: \: \: \: \: \: \: \: b)( \frac{5}{9} ) {}^{3} = \frac{5 {}^{3} }{9 {}^{3} } = \frac{125}{729} \: \: \: \: \: \: \: \: c)( \frac{11}{23}) {}^{2} = \frac{11 {}^{2} }{23 {}^{2} } = \frac{121}{529} \: \: \: \: \: \: \: \: d)( \frac{24}{31} ) {}^{2} = \frac{24 {}^{2} }{31 {}^{2} } = \frac{576}{961} [/tex]