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390.000 cm + 430.000 =820.000cm
1m= 100 cm
1000m=100x1000
=100000cm
3,9km= (100.000cmx3)+(9.000cm)=309.000cm
4,3km= (400.000cmx4)+(3.000cm)=403.000cm
jadi,309.000cm+403.000cm= 712.000cm