C(6,4)
    C(11,4)
    C(8,4)
     C(8,4)
     C(8,5)
     C(6,4)
     C(6,5)
     C(7,5)
     C(5,4)
     C(11,4)
     C(11,5)
    arccos0.969696
    11×65加53
    768÷65
    506÷30
    294÷13
    918÷51
    613÷40
    945÷13
    185÷37

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