Odpowiedzi

2010-04-10T20:19:56+02:00
(-3,6)=(Xa+Xb/2, Ya+Yb/2)
(-3,6)=(2/3+Xb/2, 3+Yb/2)

zatem
2/3+Xb/2=-3 I*2
2/3+Xb=-6
Xb=-6-2/3
Xb=-6i2/3

3+Yb/2=6 I*2
3+Yb=12
Yb=12-3=9

a wiec B=(-6i2/3,9)