Quelqu' un pourrait m'aide svp j'y arrive pas. (j'ai déjà fait les 2 premiers)

12 m = 1200cm / 10,5 cm = 0,0105dm

321 m = 3,21... / 12 m2 =..... cm2

44,5dm2 = ....cm2 / 125 m²= 1,25...

2300hm 2 =.......m2 / 4200m2=........ km2​
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