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0,9 dm2 = 0,9 dm * dm = 16 * (10*10) = 900 cm2
270cm2 = 270 * (0,1*0,1) = 2,7 dm2
4,5 m2 = 4,5 * (100*100) = 45000 cm2
1ha =100a
45 ha - 4500a