Odpowiedź :
[tex]S=(\frac{x_A+x_B}{2};\frac{y_A+y_B}{2})\\\\\frac{-3+x_B}{2}=-1\ \ \ |\cdot2\\\\-3+x_B=-2\\\\x_B=-2+3\\\\x_B=1\\\\\frac{-2+y_B}{2}=5\ \ \ |\cdot2\\\\-2+y_B=10\\\\y_B=10+2\\\\y_B=12\\\\\B(1;12)[/tex]
[tex]S=(\frac{x_A+x_B}{2};\frac{y_A+y_B}{2})\\\\\frac{-3+x_B}{2}=-1\ \ \ |\cdot2\\\\-3+x_B=-2\\\\x_B=-2+3\\\\x_B=1\\\\\frac{-2+y_B}{2}=5\ \ \ |\cdot2\\\\-2+y_B=10\\\\y_B=10+2\\\\y_B=12\\\\\B(1;12)[/tex]