( )除16=( )分之9=0.75=( :( )除16=( )分之9=0.75=( : )

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( )除16=( )分之9=0.75=( :
(        )除16=(       )分之9=0.75=(       :         )

(12 )除16=( 12)分之9=0.75=(3 :4)