DA + AB + BC = DC;
3/3AB + 3/3AB + 2/3AB = 6;
8/3AB = 6;
AB = 9/4;
EA = ED - DA;
EA = 1/2DC - 3/3AB;
EA = 3 - 9/4 = 3/4cm;
即中点E和点A之间的距离为3/4cm,即0.75cm.
DA + AB + BC = DC;
3/3AB + 3/3AB + 2/3AB = 6;
8/3AB = 6;
AB = 9/4;
EA = ED - DA;
EA = 1/2DC - 3/3AB;
EA = 3 - 9/4 = 3/4cm;
即中点E和点A之间的距离为3/4cm,即0.75cm.