b)
m^2
0,5 km^2
1 km = 1000 m
0,5km^2=0,5*(1000m)^2=0,5*1000000m^2=500000m^2
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2km^2
2km^2=0,5*(1000m)^2=0,5*1000 000m^2=2000000m^2
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12500 cm^2
1m^2=(100cm)^2=10000cm^2, stąd
1cm^2=\frac{1}{10000}m^2
12500 cm^2=12500 *\frac{1}{10000}m^2=1,25m^2
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2500dm^2
1 m^2 = 10 dm x 10 dm = (10dm)^2=100dm^2, stąd:
1dm^2=\frac{1}{100}m^2
2500dm^2=2500*\frac{1}{100}m^2=25m^2