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1)
d=m/v
m=25 g.
v=6 ml=6 cm³
d=25 g / 6cm³=4,167 g/cm³.
2)
a) 20g.(1 kg /1000 g)=0,02 Kg.
b)7000 ml.(1 l / 1000 ml)=7 l.
c)300 g. (1 kg /1000 g).(2,20462262 libras /1 kg)=0,66 libras.
d)10 cm³. (1 litros /1000 cm³)=0,01 l.
e)450 kg.(2.20462262 libras / 1kg)=992,08 lb.
f)1 l.(1000 ml/ 1l)=0.001 ml.
Un saludo.