设c(xo,yo),则有xo^2+yo^2=4设重心坐标M(x,y)则有卜培孙型链x=(0+4+xo)/3 y=(4+0+yo)/3求中判出xo=3x-4 yo=3y-4代入xo^2+yo^2=4即可
重心烂段祥燃余(饥搏x,y)点c(X,Y)3x=0+Xc+43y=4+0+YcXc=3x-4Yc=3y-4C:x^2+y^2=4(3x-4)^2+(3y-4)^2=4