Вычислите. \(log_37-log_3{\frac79}\) \(log_2{15}-log_2{30}\) \(log_{\frac12}{28}-log_{\frac12}7\) \(log_{0,2}{40}-log_{0,2}8+log_3{243}\) \(log_{\frac23}{32}-log_{\frac23}243\) \(-2\) \(2\) \(-1\) \(4\) \(5\) :