把2.46扩大到它的10倍是 ,扩大到它的1000倍是 .
24: == ÷1.2= 折=75%
= ×=36÷ = :13.5.
÷20=0.4= %=2: .
已知m÷n=7…1,则m÷n=.
6÷ =0.75= %= : =.