V powietrza=25 m2*3 m
V powietrza=75 m3
75 m3---100%
x m3---0,04%
x=0,03 m3
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V powietrza=25 m2*3 m
V powietrza=75 m3
75 m3---100%
x m3---0,04%
x=0,03 m3