2,5km=..2500...m
720g=...0,72...kg
45dm khối=........0,045.......m khối
0,8m=.......8......dm
730cm khối=.........0,73.......lít
0,3kg=...........300............g
m=87kg thì P=........870...............N
2l=............2...........dm khối =.................0,002..............m khối
2,5km=2500m
720g=0,72kg
45dm3=0,045m3
0,8m=8dm
730cm3=0,73l
0,3kg=300g
m=87kg thì P=870N
2l=2dm3=0,002m3