[tex]Punctul\;M\;are\;coordonatele:\\\\M(x_M,y_M)=M\left(\dfrac{x_A+x_B}{2},\dfrac{y_A+y_B}{2}\right)=M\left(\dfrac{1-1}{2},\dfrac{-1+3}{2}\right)=M(0,1).\\\\Distan\c{t}a\ de\ la\ punctul\;M\;la\;dreapta\;d\;este:\\\\d(M,d)=\dfrac{|5\cdot x_M-12\cdot y_M-1|}{\sqrt{5^2+(-12)^2}}=\dfrac{|5\cdot 0-12\cdot 1-1|}{\sqrt{25+144}}=\dfrac{|-13|}{13}=1.[/tex]
Green eyes.
