( )/25等于21/( )等于()/5

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( )/25等于21/( )等于()/5
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( )/25等于21/( )等于()/5
( )/25等于21/( )等于()/5

( )/25等于21/( )等于()/5
(75 )/25等于21/(7)等于(15)/5

105/25=21/5=21/5

( 15)/25等于21/(35 )等于(3)/5

(75 )/25等于21/(7)等于(15)/5

75;7;15
175;3;35