• Matéria: Matemática
  • Autor: igorgustavoo
  • Perguntado 7 anos atrás

25) 3^-2 - 3^2 =

A) 1/9 B) -1/9

C) 80/9 D) -80/9

Respostas

respondido por: GeBEfte
2

3^{-2}~-~3^2~=\\\\\\=~\left(\frac{1}{3}\right)^2~-~9\\\\\\=~\frac{1^2}{3^2}~-~9\\\\\\=~\frac{1}{9}~-~9\\\\\\=~\frac{1\,.\,1~-~9\,.\,9}{9}\\\\\\=~\frac{1-81}{9}\\\\\\~=~\boxed{-\frac{80}{9}}

Resposta: Letra (d)

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