( )/20=12/( )=2/5=( )÷( )=( )/35

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( )/20=12/( )=2/5=( )÷( )=( )/35

( )/20=12/( )=2/5=( )÷( )=( )/35
( )/20=12/( )=2/5=( )÷( )=( )/35

( )/20=12/( )=2/5=( )÷( )=( )/35
(8 )/20=12/(30 )=2/5=(14 )÷(35 )=(14 )/35

(8 )/20=12/( 30)=2/5=(4 )÷(10 )=(14 )/35

(8 )/20=12/(30 )=2/5=(14 )÷(35 )=(14 )/35
你列个式子出来,其实挺好算的