$\text{Chào bạn. Bạn tham khảo nhé !}$
$\text{Đáp án :}$
$\text{12m² 5dm²}$ = $\text{12,05m²}$ ;
$\text{6005g}$ = $\text{60,05kg}$ = $\text{600,5dag}$ ;
$\text{3kg 125g}$ = $\text{3125g}$ ;
$\text{8dam²}$ = $\text{800m²}$ ;
$\text{300m²}$ = $\text{3dam²}$ ;
$\text{20hm²}$ = $\text{2000dam²}$ ;
$\text{2100dam²}$ = $\text{21hm²}$ ;
$\text{5cm²}$ = $\text{500mm²}$ ;
$\text{900mm²}$ = $\text{9cm²}$.
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