3. Выполнить действия: 1) (-0,3m²xy⁴) ⋅ (-1,5mx²y); 2) (2/7a - 3b²) (2/7a + 3b²); 3) (15a⁵x² + 5a³x⁴) : (-5a³x) [1) (-1/7a²b⁴c³) ⋅ (-3 1/2abc³); 2) (2m² + 3/5n) (3/5n - 2m²); 3) (18x⁵y³ - 12x⁴y⁴) : (6x³y)].

3. Выполнить действия:

1. (-0,3m²xy⁴) ⋅ (-1,5mx²y) = 0,45m³x³y⁵
2. (2/7a - 3b²) (2/7a + 3b²) = (2/7a)² - (3b²)² = 4/49a² - 9b⁴
3. (15a⁵x² + 5a³x⁴) : (-5a³x) = -3a²x - x³a

1. (-1/7a²b⁴c³) ⋅ (-3 1/2abc³) = (-1/7a²b⁴c³) ⋅ (-7/2abc³) = 1/2a³b⁵c⁶
2. (2m² + 3/5n) (3/5n - 2m²) = (3/5n + 2m²)(3/5n - 2m²) = (3/5n)² - (2m²)² = 9/25n² - 4m⁴
3. (18x⁵y³ - 12x⁴y⁴) : (6x³y) = 3x²y² - 2xy³

Ответ: 1) 0,45m³x³y⁵; 2) 4/49a² - 9b⁴; 3) -3a²x - x³a; 1) 1/2a³b⁵c⁶; 2) 9/25n² - 4m⁴; 3) 3x²y² - 2xy³