(x²) ⁴*(x⁴)³=x^8*x^12=x^20
(a²a³)⁴=a^8*a^12=a^20
(mn)²*m³n⁴/m(mn)³=(m²n²*m³n⁴)/(m*m³n³)=
(m^5*n^6)/(m⁴n³)=mn³
(x²y³)^5/(x²)²*y^5=(x^10*y^15)/(x⁴*y^5)=x^6y^10
(a^-3b⁴/9)^-2*(9/a^-2b³)^-3=
81/(a^-3b⁴)²*(a^-2b³)³/729=1/a^-6b^8*(a^-6b^9)/9=b/9
(p^-4/10q^5k²)^-2:(5p²q³k)³=
(10q^5k²)²/p^-8:120p^6q^9k³=
100q^10k⁴/p^-8*1/120p^6q^9k³=
5qk/6p^-2=5/6qkp²