Question

решите пожалуйста ..........

Answer 1

lgx=lg8×20÷40
lgx=lg4
x=4

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