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a=2cm
v=a^3
v=(2cm)^3
v = 8cm3
v=8cm3
m=57,12g
d=m/v
d=57,12/8
d = 7,14 g/cm3
gęstość= masa/ objętość
V(objętość)= (2cm)^3 bo to sześcian
V= 8cm3
(d)gęstość= (m)masa/V
d=57,12g/8cm3
d= 7,14 g/cm3