Resposta:

[tex]\frac{3^{14}-1 }{3^{10} }[/tex]

Explicação passo a passo:

[tex]3^{4} -3^{-10} \\\\3^{4} -\frac{1}{3^{10} } \\\\\frac{3^{4}.3^{10} }{3^{10} } -\frac{1}{3^{10} }\\\\\frac{3^{10+4} }{3^{10} } -\frac{1}{3^{10} }\\\\\frac{3^{14} }{3^{10} } -\frac{1}{3^{10} } \\\\\frac{3^{14}-1 }{3^{10} }[/tex]