a,\(\Leftrightarrow9x^2+4x-3-9x^2-12x-4>0\)
\(\Leftrightarrow-8x-7>0\)
\(\Leftrightarrow-8x>7\)\(\Leftrightarrow x< -\dfrac{7}{8}\)
\(b,\Leftrightarrow\dfrac{4x^2-2\left(2x^2+3x\right)}{4}< \dfrac{x-1}{4}\)
\(\Leftrightarrow4x^2-4x^2-6x< x-1\)
\(\Leftrightarrow-6x-x< x-1\)
\(\Leftrightarrow-7x< -1\Leftrightarrow x>\dfrac{1}{7}\)
Vậy....
c,\(\Leftrightarrow x-1>0\Leftrightarrow x>1\)
Vậy....