B1)Điền số?
1m2=......dam2=........ha
15m2=.......dam2=.......hm2
8000m2=...........ha
1400cm2=..............m2
5ha=.............km2
B2) So sánh
2m2 5dm2 .........2,5m2
5m2 3dm2 ..........5,03m2
3m2 375cm2..........3,4m2
4km2 5m2 ..........4,00005km2
2hm2 15 dam2.........2,05hm2
44000m2 5dm2 .........4,5ha