72m2= cm2 50t= kg20000m= km 45L﹣36000ml= mL56000g﹣20kg= kg 12t= g.
3.5== : (最简比).
÷16== %=0.75=18: .
4: ===24÷ = %
0.125= %= ÷16==.
= ÷25=0.6= ÷45.