5.04×2.1的积是 位小数,估计这个积比10 .
0.75==6÷( )=12:( )=( )%
0.25== :16=5÷ = %
:20=0.8=12÷ == %= (填成数)
= %= : = (小数)
: =37.5%== ÷ = (填小数)