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1)2,8dam=..cm 


3600dm=.........km


45hm=.....dm


7145000mm  =.km 8km=...dam


5200cm=..m




Răspuns :

1dam=10m=1000cm,deci 2,8dam=28oocm
1m=10dm,deci 3600dm=360m=0,360km
1hm=100m,deci 45hm=4500m=45000dm
1m=1000mm,deci 7145000mm=7145m=7,145km
1km=1000m,1dam=10m,deci 8km=8000m=800dam
1m=100cm,deci 5200cm=52m
1)
2,8 dam = 2800 cm
3 600 dm = 0,36 km
45 hm = 45 000 dm
7 145 000 mm = 7,145 km
8 km = 800 dam
5200 cm = 52 m

1. 4,8 dm = 48 cm
   P = 4l
   l = 48 : 4 = 12 cm

2. L = 5 x 2 = 10 m
   10 m = 1000 cm
   5 m = 500 cm
   P = 2 ( L + l )
   P = 2 ( 1000 + 500 ) = 2 x 1500 = 3000 cm

3. 28,8 : 3 = 9,6 cm ( prima lungime )
   9,6 x 2 = 29,2 cm ( a doua lungime )

4. L = 42 cm
   0,2 dm = 2 cm
   l = 42 - 2 = 40 cm
   P = 2 ( 42 + 40 ) = 2 x 82 = 164 cm