Помогите ,..........
1. -2,5m(-2)m³m² = 5m⁶ 2. abc12b²c³ = 12ab³c⁴ 3. -4xy(-3)x²y(-2)xy⁴ = -24x⁴y⁶ 4. 2/3 ax³12ac²x = 8a²c²x⁴