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S=((xa+xb+xc)/3 ; (ya+yb+yc)/3)
A=(4;-6)
B=(0;2)
xa=4
xb=0
ya=-6
yb=2
S=(1;-5)
xs=1
ys=-5
xs=(xa+xb+xc)/3 =(4+0+xc)/3 =(4+xc)/3 =1
ys=(ya+yb+yc)/3 =(-6+2+yc)/3 =(-4+yc)/3 =-5
(4+xc)/3 =1 /*3
4+xc=3
xc=3-4
xc=-1
(-4+yc)/3 =-5 /*3
-4+yc=-15
yc=-15+4
yc=-11
C=(-1;-11)
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