(2 10/27)⁻¹/³ - (1/2)⁻² + (1/3)⁰=
(27/64)¹/³ - 2² + 1=
3/4 - 4 + 1=-3 +3/4= -2 1/4
27¹/³=∛27=3
(1/2)⁻²=1/(1/2)²=1 : (1/4)=4.
