punkt-sleft32right-jest-srodkiem-odcinka-ab-gdzie-alefta1right-i-blefta53right

$a=2$a=2

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

$a=-1$a=-1

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