C(4,2)*C(39,2)/C(43,4)
    C(4,1)*C(39,3)/C(43,4)
    5^(3/10)
    5^(3/10)
    1998/1998*1998/1999+1/2000
    27.5×0.55-27.5×0.15=
    27.5×0.52-27.5×0.15=
    27.5×0.51-27.5×0.15=
    27.5×0.5-27.5×0.15=
    27.5×0.52-27.5×0.15=
    27.5×0.55-27.5×0.15=
    100÷（1.25÷1.5）
    C(100,20)
    e1
    1-0.999^1000
    C(4,1)*C(39,3)/C(43,4)
    C(4,2)
    tan20tan30+tan30tan40+tan40tan20
    tan20tan30+tan30tan40+tan40tan20
    505885997*1976730144598190963568023014679333

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