9个0.1是 ，3个 是0.03，0.06里面有 个0.001．
12÷ == %= 折=0.6．
= ：15=15÷ = %=0.6．
==8÷2==36÷ ．
==18÷ =．
÷40==0.375=9÷ =．
= %= 折=0.6．
= ：15=15÷ = %=0.6．
=
=8÷2=
=36÷ ．
=
=18÷ =
．
=0.375=9÷ =
．
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