15m2= dm2 5公顷= m212千米2= 公顷 9200dm2= m2．
÷5== =0.6=15÷ ．
==0.25==．
15： ==36÷ = %
0.6== ： = ÷ ．
12÷ ==0.375= ：24．
=
=0.6=15÷ ．
=
=0.25=
=
．
=36÷ = %
= ： = ÷ ．
=0.375= ：24．
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