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    31-22=9
    31-24=7
    31-27=4
    31-20=11



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  • 4,9,7,11



  • ×î¼Ñ´ð°¸ - ÓÉͶƱÕß2007-11-29 22:12:07Ñ¡³ö

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    a+b+c=22....................................(1)
    a+b+d=24....................................(2)
    a+c+d=27....................................(3)
    b+c+d=20....................................(4)
    (1)+(2)+(3)+(4):
    3(a+b+c+d)=93,¡ú
    a+b+c+d=31..................................(5)
    (5)-(4):a=11
    (5)-(3):b=4
    (5)-(2):c=7
    (5)-(1):d=9



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