Resposta:
a) [tex]1463^{-8}[/tex]
b) [tex]AB^{-20}[/tex]
Explicação passo a passo:
a)
[tex](19^{-3} * 11^{4} * 7^{3}) ^{-2}\\\\(19 * 11*7^{-3 + 4 + 3}) ^{-2} \\\\(1463^{4})^{-2}\\\\1463^{-8}[/tex]
b)
[tex](a^{6} * b^{-11})^{4}\\\\(a*b ^{6+(-11)})^{4}\\\\(AB^{-5})^{4}\\\\AB^{-20}[/tex]
