M(x,y)
xA+xB=2x,yA+yB=2y,k(AB)=(yA-yB)/(xA-xB)=k(L)=(y-2)/x
[(xA)^2/4+(yA)^2]-[(xB)^2/4+(yB)^2]=1-1
(xA+xB)*(xA-xB)+4(yA+yB)*(yA-yB)=0
2x+4*2y*(yA-yB)/(xA-xB)=0
x+4y*(y-2)/xx=0
x^2/4+(y-1)^2=1
M(x,y)
xA+xB=2x,yA+yB=2y,k(AB)=(yA-yB)/(xA-xB)=k(L)=(y-2)/x
[(xA)^2/4+(yA)^2]-[(xB)^2/4+(yB)^2]=1-1
(xA+xB)*(xA-xB)+4(yA+yB)*(yA-yB)=0
2x+4*2y*(yA-yB)/(xA-xB)=0
x+4y*(y-2)/xx=0
x^2/4+(y-1)^2=1