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![](https://rs.olm.vn/images/avt/0.png?1311)
\(a\text{)}25dam^2=2500m^2\)
\(b\text{)}\dfrac{1}{10}km^2=100000m^2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(7ha=70000m^2\)
\(13km^2=1300ha\)
\(\dfrac{1}{10}ha=1000m^2\)
\(\dfrac{3}{5}ha=6000m^2\)
\(50000m^2=5ha\)
\(34000ha=340km^2\)
\(\dfrac{1}{10}km^2=10ha\)
\(\dfrac{1}{2}km^2=50ha\)
![](https://rs.olm.vn/images/avt/0.png?1311)
4ha=40 000m2 1/2ha=5000m2
1/100ha=100m2
20ha=200 000m2 1/10km2=10ha
1km2=100ha 3/4km2=75ha
15km2=150ha
b) 60 000m2=6ha 1800ha=18km2 27000ha=270km2
800 000m2=80ha
![](https://rs.olm.vn/images/avt/0.png?1311)
2608m2 = 26 dam2 = 8 m2
30000hm2= 30000 ha
8dm2 9cm 2 = 809 cm2
2m5dm = 2,5 m
12m26dm2= 12,26 m2
9km2 72 m2 = 9,000072 km2
25dam2= 0,25 m2
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{3}{6}:2=\frac{1}{2}.\frac{1}{2}=\frac{1}{4}\)
De the mackhong lam duoc ngu qua!