1.dien so hoac phan so thich hop
4km2 62ha = ..... m2 2m47mm = .....mm
7km2 6m2 =.....m2 8dam2 4m2 = ....m
7km5m = .....m 8 tan 6kg = ...... kg
7yen 16g =...g 4575m = .....km ......m
37054mm=....m.....mm 5687kg =....tan ......kg
4087g =......kg...g 6434dam2 = .....ha .....m2
838mm2 = ....cm2.....mm2