Question

срочно нужна помощь.......​

Answer 1

$log_{2}(15) - log_{2}( \frac{15}{16} ) = \\ = log_{2}(15) - (log_{2}(15) - log_{2}(16) ) = \\ = log_{2}(15) - log_{2}(15) + log_{2}(2 {}^{4} ) = 4$