Представте в виде многочленов (0,5x-2y)^3. (1/3a-1/2b)^3. (-2/5+5/3x)^3

1) (0,5x - 2y)³ = (0,5x - 2y)²(0,5x - 2y) = (0,25x² - 2 * 0,5x * 2y + 4y²)(0,5x - 2y) = (0,25x² - 2xy + 4y²)(0,5x - 2y) = 0,125x³ - 0,5x²y - x²y + 4xy² + 2xy² - 8y³ = 0,125x³ - 1,5x²y + 6xy² - 8y³;

2) (1/3a - 1/2b)³ = (1/3a - 1/2b)²(1/3a - 1/2b) = (1/9a² - 2 * 1/3a * 1/2b + 1/4b²)(1/3a - 1/2b) = (1/9a² - 1/3ab + 1/4b²)(1/3a - 1/2b) = 1/9a² * 1/3a - 1/9a² * 1/2b - 1/3ab * 1/3a + 1/3ab * 1/2b + 1/4b² * 1/3a - 1/4b² * 1/2b = 1/27a³ - 1/18a²b - 1/9a²b + 1/6ab² + 1/12ab² - 1/8b³ = 1/27a³ + a²b(- 1/18 - 1/9) + ab²(1/6 + 1/12) - 1/8b³ = 1/27a³ - 1/6a²b + 1/4ab² - 1/8b³;

3) (-2/5 + 5/3x)³ = (-2/5 + 5/3x)²(-2/5 + 5/3x) = (4/25 - 2 * 2/5 * 5/3x + 25/9x²)(-2/5 + 5/3x) = (4/25 - 4/3x + 25/9x²)(-2/5 + 5/3x) = - 4/25 * 2/5 + 4/25 * 5/3x + 4/3x * 2/5 - 4/3x * 5/3x - 25/9x² * 2/5 + 25/9x² * 5/3x = - 8/125 + 20/75x + 8/15x - 20/9x² - 50/45x² + 125/27x³ = - 8/125 + 60/75x - 150/45x² + 125/27x³.