Question

(-2/3)^2 - (-2/3)^-2 calcule

Answer 1

(-2/3)² - (-2/3)-² =

4/9 - 1/(-2/3)² =

4/9 - 1/( 4/9) =

4/9 - 9/4 =

(16-81)/ 36 =

-75 / 36 =

-25/12 → Resposta.

Answer 2

Olá!
Por partes:
(-2/3)^2 = (-2)^2 / 3^2 = 4/9

(-2/3)^-2 = (-2)^-2 / 3^-2 = (1/4) / (1/9) = (1/4).(9/1) = 9/4

Logo:
(4/9) - (9/4) = (16 - 81) / 36 = -65/36