计算0.35×1.3的积一定是三位小数. .
0.75==6÷( )=12:( )=( )%
0.25== :16=5÷ = %
:20=0.8=12÷ == %= (填成数)
= %= : = (小数)
: =37.5%== ÷ = (填小数)