Bài 3 : a) ( x - 1 ) ( x -2 ) > 0 b) 2x - 3 < 0 c ) ( 2x - 4 ) ( 9 - 3x ) > 0 d ) $\frac{2x}{3}$ - $\frac{3}{4}$ > 0 e ) ( $\frac{3}{4}$ - 2x ) ( $\frac{-3}{5}$ + $\frac{2}{-61}$ - $\frac{17}{51}$ ) ≤ 0 f ) ( $\frac{3}{2x}$ - 4 ) . $\frac{5}{3}$ > $\frac{15}{6}$

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