a) Rysunek w zalacznikach.
[tex]A = (-2, 1)\\B = (2, -1)\\S = (\frac{x_1+x_2}2; \frac{y_1+y_2}2)\\S=(\frac{-2+2}{2}; \frac{1-1}2)\\S=(0; 0)[/tex]
b)
[tex](2, -1) = (\frac{-2+x}{2}; \frac{1+y}{2})\\2=\frac{-2+x}2 /*2\\4=-2+x\\6=x\\\\-1=\frac{1+y}2 /*2\\-2=1+y\\-3=y\\\\C=(6, -3)[/tex]
