Oblicz \frac{log_749}{log_{\frac{1}{3}}81}-2log_{\sqrt2}2=
wynik -9/2
źródło:
{\frac{log_749}{log_{\frac{1}{3}}81}-2log_{\sqrt2}2=\frac{log_77^2}{log_{\frac{1}{3}}3^4}-2log_{\sqrt2}(\sqrt2)^2=\frac{2}{log_{\frac{1}{3}}(\frac{1}{3})^{-4}}-2\cdot 2=\frac{2}{-4}-4=-4\frac{1}{2}=-\frac{9}{2}}