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x-powierzchnia na mapie
1:20 000 000
1cm-20 000 000cm
1cm-200 000m
1cm-200km
1cm²-40 000km²
1cm²-40 000km²
x-510 000 000km²
40 000x=510 000 000cm²/:40 000
x=12 750cm²
b)
x-powierzchnia na mapie
1:42 000
1cm-42 000cm
1cm-420m
1cm-0,42km
1cm²-0,1764cm²
1cm²-0,1764cm²
x-13,23km²
0,1764x=13,23cm²/:0,1764
x=75cm²