dien so hoac phan so thich hop vao cho cham
4km2 62ha = ........m2
4575m = .................km .......................m
37054mm =................m ................. mm
5687kg = ............... tan .................kg
4087 g =......kg .................g
6434dam2 =.................ha ..........m2
834mm2 =..........cm2 ..........mm2