(2x-y)³ adalah.......

(2x - y) (2x - y)
= 4x² - 2xy - 2xy + y²
=4x² -4xy + y²

(4x² - 4xy + y²) ( 2x - y)
=8x³ - 4x²y - 8x²y + 4xy² + 2xy² - y³
=8x³ - 12x²y + 6xy² - y³

Mengunakan cara sifat bilangan berpangkat
(2x-y)³ = (2x-y)x(2x-y)x(2x-y)
= ( 4x^2 -4xy+y^2) x (2x-y)
= 8x^3 -4x^2y-8x^2y+4xy^2+
2xy^2 -y^3
= 8x^3 -12x^2y+6xy^2-y^3