punkt-sleft41right-jest-srodkiem-odcinka-ab-gdzie-alefta0right-i-blefta32right

$a=0$a=0

$\displaystyle a= \frac{1}{2}$\displaystyle a= \frac{1}{2}

$a=2$a=2

$\displaystyle a= \frac{5}{2}$\displaystyle a= \frac{5}{2}