Question

решите пожалуйста ..........

Answer 1

lgx=lg8×20÷40
lgx=lg4
x=4

$lgx = \frac{ log_{5}(27) - log_{5}(9) }{ log_{5}(45 \times 0.2)} \\ lgx = \frac{ log_{5}(27 \div 9) }{ log_{5}(9) } \\ lgx = \frac{ log_{5}(3) }{ log_{5}(9) } \\ lgx = log_{9}(3) \\ lgx = \frac{1}{2} \\ x = \sqrt{10}$