M(x,y)- mijlocul unui segment AB
[tex]X=\frac{X_{A}+X_{B} }{2} \\Y=\frac{Y_{A+Y_{B} } }{2}[/tex]
b)
[tex]X=\frac{2-\sqrt{3} +\sqrt{3} }{2} =1\\Y=\frac{-\frac{4}{5}-\frac{11}{5} }{2}=\frac{3}{2} \\[/tex]
c)
[tex]X=\frac{-3+17}{2}= 7\\Y=\frac{-4+\sqrt{5}+4+\sqrt{5} }{2} =\sqrt{5}[/tex]