Bonjour voilà la réponse :
exo 9 :
1m² = 10dm²
1m² = 100cm²
1m² = 1000mm²
1m² = 0.1dam²
1m² = 0.01hm²
1m² = 0.001km²
exo 10
1) a. 1dm² = 10cm²
b. 1cm² = 10mm²
c. 1dm² = 100mm²
2) a. 1dam² = 0.1hm²
b. 1hm² = 0.1km²
c. 1dam² = 0.01km²
exo 11
a) 45m² = 4.9dam² = 0.49hm² = 0.049km²
b) 12500dm² = 125dam² = 125000cm² = 1250m²
exo 14
a) 0.02m² = 200..²
b) 0.031dam² = 3.1dm²
c) 4cm = 0.04m²
d) 23hm² = 230000cm²
Voilà j'espère avoir pu t'aider ^^
