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Sagot :

Bonjour,

1)

1cm -> 500 000cm

20 cm -> 500 000 *20 => 10 000 000 cm = 100km

2)

500 000 cm = 5km

5km -> 1cm

1km -> 1/5

258km -> (258 *1) /5 => 51,6 cm

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