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0,5m=50cm
20x120x50=120000cm 3
120000cm 3=0,12m 3
12dm=1,2m
5m
V=abc
V=2*1,2*5
V=12m³ 1m³=1000000cm³
V=12000000cm³
Odp.: Objętość tego prostopadłościanu wynosi 12m³, czyli 12000000cm³.