( ):( )=21/( )=( )/40=87.5%( ):( )=21/( )=( )/40=87.5%

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( ):( )=21/( )=( )/40=87.5%( ):( )=21/( )=( )/40=87.5%
( ):( )=21/( )=( )/40=87.5%
( ):( )=21/( )=( )/40=87.5%

( ):( )=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%

7；x=21；4 x-4/5x-4=21 x-4/5-4=21 4×21+3.25χ=3.6×（χ＋21﹚ 8/21×()=()×9=9/4×()=1 ()÷4=37.5%=()分之21=():16 1/18+(2/3+4/21)=? 4(x-2.8)=21解方程 4x+3x=21, 21/1×4/12×8/7=? 0.375乘21分之4= X÷3+21×4=18 4x^2-8x=21 11-4+6-9+31*21= x^2-4x-21=0 （3a+4）*3=21 ×-4/9×=10/21 解方程 8／21除以X=4