Oblicz 7 19/32 do potęgi -2/5 × 81do potęgi 3/4 daje naj szybko potrzebne

[latex](7frac{19}{32})^{-frac{2}{5}}cdot 81^{frac{3}{4}} = (frac{243}{32})^{-frac{2}{5}}cdot (3^4)^{frac{3}{4}} = [(frac{3}{2})^5]^{-frac{2}{5}}cdot 3^3=(frac{3}{2})^{-2}cdot 3^3=\=(frac{2}{3})^2cdot 3^3 = frac{4}{9}cdot 27 = 12[/latex]