Explicação passo-a-passo:
a)
[tex]9km = 9km \times \frac{1000m}{1km} = 9000m[/tex]
b)
[tex]4.5m = 4.5m \times \frac{10dm}{1m} = 45dm[/tex]
c)
[tex]1.67km = 1.67km \times \frac{100000cm}{1km} = 167000cm[/tex]
d)
[tex]0.89m = 0.89m \times \frac{1000mm}{1m} = 890mm[/tex]
e)
[tex]1800000mm = 1800000mm \times \frac{1km}{1000000mm} = 1.8km[/tex]
f)
[tex]657dam = 657dam \times \frac{1000cm}{1dam} = 657000cm[/tex]
