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162000x1.29=208980g=20898dag≈209kg
V=9*6*3=162
V=162m=16200cm=1620dm
1620dm*1,29g/dm=2089,8g
Masa powietrza w klasie wynosi: 2089,8g
V=162m sześcienne
1m sześcienny = 1000dm sześciennych
162m3 = 162000dm3
1dm3 - 1,29g
162000dm3 * 1,29g = 208980g