1.2=3/( )=5/( )=( )/20=10/( )

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1.2=3/()=5/()=()/20=10/()1.2=3/()=5/()=()/20=10/()1.2=3/()=5/()=()/20=10/()2.56分之25243分之25

1.2=3/( )=5/( )=( )/20=10/( )
1.2=3/( )=5/( )=( )/20=10/( )

1.2=3/( )=5/( )=( )/20=10/( )
2.5 6分之25 24 3分之25