1/2lg81-lgx>lg2 cpo4Ho TTo)l(aJlyNcTa

1/2*lg81 - lg x > lg2lg√81 - lgx > lg2lg9 - lgx > lg2lgx < lg9 - lg2lgx < lg(9:2)lgx < lg4,5x < 4,5x∈(-∞; 4,5)