把3.14的小数点向右移动一位是 ;把68缩小到它的 倍是0.68.
15÷ =62.5%= :16== (小数)
= ÷25=40%= :45.
24: == ÷1.2= 折=75%
= ×=36÷ = :13.5.
÷20=0.4= %=2: .