3⁻³ * 81¹/₂ -81¹/₄ : 3⁻² =3⁻³ * (3⁴)¹/₂ - (3⁴)¹/₄ : 3⁻² =3⁻³⁺² - 3¹⁺²=
=3⁻¹ -3³=1/3-27 =-26 2/3
27¹⁾₃ : 3⁻¹ -2⁻⁴ * 64 ¹⁾₃ = (3³)¹⁾₃ : 3⁻¹ - 2⁻⁴ *(2⁶)¹⁾₃ =3¹⁺¹ - 2⁻⁴⁺²=3²-2⁻²=9-1/4=8 3/4
∛(7-√22)*∛(7+√22) =∛(7²-(√22)²) = ∛(49-22) =∛27 =3
∛(9+√17)* ∛(9-√17)=∛(9²-(17)²)=∛(81-17)=∛64=4