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Fă următoarele transformări:
8km + 300m = ___hm
3dam+ 9m = ___dm
4km+ 7m = ___m
3km+ 40m = ___dam
7800km+30hm=___dam
3000hm+400m= ___dm
8000km+900m=___dam
20 000mm+300dm =___dam