在横线上填上“>”、“<”或“=”.0.090 0.09 1 1.0100.21 0.021 0.010 0.100.
20: =0.8==24÷ = %.
=8÷ = :20=0.25.
=15÷ = ÷30=七五折= %
6: == %= ÷32.
1.5=18÷ == :6= %