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Sagot :

THEO

Bonsoir,

a) 42 dm² = (42 : 10³)² hm²

= 42 : 10⁶ hm²

= 0,000042 hm²

b) 25 000 cm² = (25 : 10⁴)² hm²

= 25 : 10⁸ hm²

= 0,00025 hm²

c) 190 dm² = (190 : 10³)² hm²

= 190 : 10⁶ hm²

= 0,000190 hm²

d) 2 dam² = 2 : (10)² hm²

= 2 : 10² hm²

= 0,02 hm²

e) 45,6 m² = (45,6 : 10²)² hm²

= 45,6 : 10⁴ hm²

= 0,00456 hm²

f) 28 000 mm² = (28 000 : 10⁵)² hm²

= 28 000 : 10¹⁰ hm²

= 0,0000028000 hm² ✅

Bonne soirée !

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