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a-70m=7000cm
b-50m=5000cm
1:100
a-7000cm:100=70cm=7m
b-5000cm:100=50cm=5m
1:1000
a-7000cm;1000=7cm
b-5000cm:1000=5cm
1:10000
a-70000mm:10000
b-50000mm:10000
pozdro:)