把3.210的小数点去掉,这个数扩大了1000倍. .(判断对错)
=15: =60%= ÷40= (填小数)
( )÷25==26÷( )=0.52=( )%
0.6= ÷20=6: ==.
12÷15===.
=20%= ÷40=40: = [填小数].