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1 . obl. objętość stropu:
V = a*b*c
V = 12 m* 6 m * 0,2 m
V = 14,4 m^3
dane:
V = 14,4 m^3
d = 2400 kg/m^3
m = ?
d = m/V
m = d*V
m = 2400 kg/m^3 * 14,4 m^3
m = 34560 kg