4800dm2= cm2 50t= kg68000000m2= km2 108L= mL860kg﹣38000g= kg 35km2﹣7000m2= m2.
0.6== ÷30= %
9÷ =0.75= :24= %= 折.
9÷ =0.75== :36= %
6÷ = /16=0.25= :4= %
25÷ =6: =0.5.