[tex][( \frac{2}{9} ) ^{3} ] ^{4} = \frac{2}{9} ^{12} [/tex]
[tex][( \frac{5}{7} ) ^{6} ] ^{3 ^{2} } =[ (\frac{5}{7} )^{6} ] ^{9} = \frac{5}{7 } ^{54} [/tex]
[tex][( \frac{2}{3} ) ^{2 ^{3} } ] ^{5} = [(\frac{2}{3} ) ^{8} ] ^{5} = \frac{2}{3} ^{40} [/tex]