分数、百分数、小数互化． 例：="0.5=50%"

=　   　=	=　   　="12.5%"
=0.1=	=　   　=
=　   　=37.5%	=0.05=
=　   　=	=　   　="62.5%"
=0.04=	=　   　=
=　   　="87.5%"	=0.02=
=　   　=	=　   　=　   　．