b) B = (5x³y² – 4x²y³) : 2x²y² + (3x⁴y + 6xy²) : 3xy – x(x² – 0,5).

b) B = (5x³y² – 4x²y³) : 2x²y² + (3x⁴y + 6xy²) : 3xy – x(x² – 0,5)

= 5x³y² : 2x²y² – 4x²y³ : 2x²y² + 3x⁴y : 3xy + 6xy² : 3xy – x.x²­ + x.0,5

= 2,5x – 2y + x³ + 2y – x³ + 0,5x

= (2,5x + 0,5x) + (–2y + 2y) + (x³ – x³)