(0.25a⁻⁴y⁻³)²(a⁻³/4y²)⁻³=(1/4²a⁻⁸y⁻⁶a⁹y⁺⁶4³=4³⁻²a⁻⁸⁺⁹y⁻⁶⁺⁶ =4ay°=4a; (x⁻³y⁴/9)⁻²(3/x⁻²y³)⁻³=9²x⁶y⁻⁸(3⁻³/x⁶y⁻⁹)=3⁴⁻³x⁶⁻⁶y⁻⁸⁺⁹=3y; (m⁻⁴/10n⁵k²)⁻²:(5m²n³k)³=m⁸/((10n⁻¹°k⁻⁴)(5³m⁶n⁹k³)=m⁸/10·5³n⁻¹°⁺⁶k⁻⁴⁺³m⁶ = 5³10m⁸⁻⁶n⁴k=1250m²n⁴k;