⒈ ( )∶20 = 24∶( )= ( )分之12 = 0.8 = ( )%

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⒈ ( )∶20 = 24∶( )= ( )分之12 = 0.8 = ( )%

⒈ (16)∶20 = 24∶(30)= (15)分之12 = 0.8 = (80)%

(16 )∶20 = 24∶(30 )= ( 15)分之12 = 0.8 = (80 )%