1) A^-3 - A^-5 = 1|A^3 - 1\A^5 = (A^2 - 1) |A^5
2) A^-4 - A^-2 = 1\A^4 - 1|A2 = (1 - A^2 ) \ A^4
3) (A^2 - 1) \ A^5 : (1-A^2) \ A^4 = - (A^2 - 1) *A^4 \ -A^5*(1-A^2) = - 1 | A = (- A^-1)
(a⁻³(1-a⁻²))/(a⁻²(a⁻²-1))=-a⁻¹
1) A^-3 - A^-5 = 1|A^3 - 1\A^5 = (A^2 - 1) |A^5
2) A^-4 - A^-2 = 1\A^4 - 1|A2 = (1 - A^2 ) \ A^4
3) (A^2 - 1) \ A^5 : (1-A^2) \ A^4 = - (A^2 - 1) *A^4 \ -A^5*(1-A^2) = - 1 | A = (- A^-1)
(a⁻³(1-a⁻²))/(a⁻²(a⁻²-1))=-a⁻¹