Răspuns:
Explicație:
7.
450g500mg=450,5g=0,4505kg
150g700mg=150,7g=0,1507kg
50g200mg=50,2g=0,0502kg
8.
a) 3kg800g+2kg700g=3kg+800g+2kg+700g=5kg+1500g=
=5kg+1000g+500g=6kg+500g=6kg500g
sau
3kg800g+2kg700g=3,8kg+2,7kg=6,5kg=6kg500g
b) 70g20mg -49g130mg=70g+20mg -49g-130mg=21g-110mg=
=20g+1g-110mg=20g+1000mg-110mg=20g+890mg=20g890mg
sau
70g20mg -49g130mg=70,02g-49,13g=20,89g=20g890mg
c)24kg200g-12kg800g=24kg+200g-12kg-800g=12kg-600g=
=11kg+1kg-600g=11kg+1000g-600g=11kg+400g=11kg400g
sau
24kg200g-12kg800g=24,2kg-12,8kg=11,4kg=11kg400g
