把下列和数保留三位小数. 2.390390≈ 8.4≈ 0.≈ .
:32===6÷ = .
= :24=0.625=20÷ = .
比的前项是0.4,比值是,则比的后项是 .
=0.75= ÷12=1.8: = :24.
=0.8==16÷( )=从左到右依次是 .