$\displaystyle \left(-\infty, \frac{1}{2} \right]$\displaystyle \left(-\infty, \frac{1}{2} \right]

$\left(-1,2\right)$\left(-1,2\right)

$\displaystyle \left(0, \frac{5}{2} \right)$\displaystyle \left(0, \frac{5}{2} \right)

$\displaystyle \left[ \frac{5}{2},+\infty \right)$\displaystyle \left[ \frac{5}{2},+\infty \right)