5a=7b,则a:b =( ):( )

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5a=7b,则a:b=():()5a=7b,则a:b=():()5a=7b,则a:b=():()7:57:5

5a=7b,则a:b =( ):( )
5a=7b,则a:b =( ):( )

5a=7b,则a:b =( ):( )
7:5

7:5