Answered

4 Compléter.
a.2,7mm²=.........cm²
b.0,74dm²=.........cm²
c.567cm²=...........m²
d.2dam²=...............km²
e.6,7km²............m²


​

Sagot :

1 mm = 1/10 cm donc : 2,7 mm² = (2,7 ÷ 10²) cm² = 0,027 cm²

1 dm = 10 cm donc : 0,74 dm² = (0,74 × 10²) cm² = 74 cm²

1 cm = 1/100 m donc 567 cm² = (567 ÷ 100²) m² = 0,0567 m²

1 dam = 1/100 km donc : 2 dam² = (2 ÷ 100²) km² = 0,0002 km²

1 km = 1 000 m donc : 6,7 km² = (6,7 × 1 000²) m² = 6 700 000 m²