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d=7,9g/cm³
m=1kg=1000g
d=m/V => V=m/d
V=126,58cm³
2.
d=700kg/m³=0,7gcm³
V=500cm³
d=m/V => m=d*V
m=350g
m=g*v=700 kg na m3 * 0,5 m 3= 350 kg