)=0.35=21:( )=( )÷80
问题描述：
)=0.35=21:( )=( )÷80
答
20分之7=0.35=21:60=28÷80
答
20分之(7 )=0.35=21:(60 )=( 28)÷80
)=0.35=21:( )=( )÷80
20分之7=0.35=21:60=28÷80
20分之(7 )=0.35=21:(60 )=( 28)÷80