把2.83扩大100倍后是 ;把54缩小 倍后是0.054.
填上适当的数. 7÷13== ÷ ÷7= 9cm=dm.
=12: =0.75= %
= : =27÷ =.
÷2== 折= %=0.75.
3:8= ÷ =.