Giúp với anh chị !!!!!!!!!

$\text{3 m² 15 dm² = 315 dm²}$

$\text{9 m² 6 dm² = 9 , 06 m²}$

$\text{3 , 05 ha = 30500 m²}$

$\text{21 , 087 m² = 210870 cm²}$

$\text{---------}$

$\text{227 m² 30 dm² = 227 , 3 m²}$

$\text{16 km² 500 m² = 1600500 ha}$

$\text{17865 m² = 1 , 7865 ha}$

$\text{154 dm² = 1 , 54 m²}$