a: \(\dfrac{3x-1}{2-5x}< 0\)
\(\Leftrightarrow\dfrac{3x-1}{5x-2}>0\)
=>x>2/5 hoặc x<1/3
b: \(\dfrac{3x-2}{1-2x}< 1\)
\(\Leftrightarrow\dfrac{3x-2-1+2x}{1-2x}< 0\)
\(\Leftrightarrow\dfrac{5x-3}{2x-1}>0\)
=>x>3/5 hoặc x<1/2
c: \(\dfrac{2x\left(3x-5\right)}{x^2+1}< 0\)
=>2x(3x-5)<0
=>x(3x-5)<0
=>0<x<5/3