取坐标系:A(0,0).B(2,0),D(0,2),则E(1,2),F(1.5,1)
EF斜率=-2, MN斜率=1/2.MN方程:y-1=(1/2)(x-1.5).
取x=0.得到y=0.25 即M(0,0.25),同理N(2,1.25)
AM/BN=0.25/1.25=1/5
取坐标系:A(0,0).B(2,0),D(0,2),则E(1,2),F(1.5,1)
EF斜率=-2, MN斜率=1/2.MN方程:y-1=(1/2)(x-1.5).
取x=0.得到y=0.25 即M(0,0.25),同理N(2,1.25)
AM/BN=0.25/1.25=1/5