( ):( )=21/( )=( )/40=87.5%( ):( )=21/( )=( )/40=87.5%
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( ):( )=21/( )=( )/40=87.5%
( ):( )=21/( )=( )/40=87.5%
7:8=21/24=35/40=87.5%
( 7 ):( 8 )=21/( 24 )=( 35 )/40=87.5%
7,8,24,35 六年级的题
7:8=21/35=35/40=87.5%
倒着算，逆向思维
( 7):(8 )=21/(24 )=(35 )/40=87.5%