动物园里有大象9头,金丝猴4只.金丝猴的数量是大象的.
0.75= :28== %=24÷ .
18÷ = ÷25=0.6==.
=0.25==27÷ = ÷48.
12: == : = :12.
=15÷ = ÷30=七五折= %