√-4
    C(5，3)
    （26.7-0.24）×（7.8-0.24）
    10^e
    9×（0.055470×0.055470）-sin（0.055470）-1
    9/0.121
    9/3
    C(7,5)
    C(6,5)
    C(5,4)
    C(11,5)
    C(7,4)
    C(6,4)
    C(11,4)
    C(8,4)
     C(8,4)
     C(8,5)
     C(6,4)
     C(6,5)
     C(7,5)

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