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V-objętość kostki
V=0,12³=0,001728[m³]
1m³-2500kg
0,001728m³-x
x=(2500kg*0,001728m³)/1m³= 4,32kg
V=1728
1728----0,001728
1---2500
0,001728----x
x=4,32
dane: a=12cm, d=2500kg/m3=2,5kg/dm3
szukane: m
m = d*V V=a^3 = [12cm]^3 = 1728 cm3 = 1,728 dm3
m = 2,5kg/dm3*1,728dm3 = 4,32 kg
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