4.5×10六次方mm= mm =4.5×10六次方mm= mm =

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4.5×10六次方mm= mm =4.5×10六次方mm= mm =

4.5×10六次方mm= mm =4.5×10六次方mm= mm =
4.5×10六次方mm= mm =
4.5×10六次方mm= mm =

4.5×10六次方mm= mm =4.5×10六次方mm= mm =
10六次方=10*10*10*10*10*10=1000000
4.5*1000000=4500000mm=450000cm=45000dm=4500m=4.5km

4500000 4500