Hsil dri (-2/3)⁴ × (1/2-1/6)²

(-2/3)⁴ x (6/12-2/12)²(
-2/3)⁴ x (4/12)²
(-2/3)⁴ x (1/3)²
(-2/3×1/3)⁴+²
(-2/9)^6

(16/81) x (1/2-1/6)^2 –> 16/729