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m = 23 g
d = 920 kg/m3 = 0,92 g/cm3
szukane:
V = ?
d = m/V I*V
V * d = m /:d
V = m/d = 23g/0,92g/cm3
V = 25 cm3
ro=m/V
m=ro V
V=m/ro
V=23 / 0,92
V=25cm*3