Раскрываем скобки
-0,25*(a^30)*(b^8)*a*(b^7)*4/7=-(a^31)*(b^15)/7
1) 3 × 3¹¹ - 9 = 9 × (3¹⁰ - 1) = 531432
2) 4 - 5 : 4⁻³ = 4 - 5 × 4³ = 4 × (1 - 5 × 4²) = 4 × (1 - 80) = - 316
3) (3⁻³)⁻² = 3⁶ = 729
<span>5√3-√300-√27=</span>5√3-√3*100-√9*3=<span>5√3-10√3-3√3</span>= - 8√3