C(43,4)
    [C(3,2)*C(40,2)+C(40,1)*C(3,3)]/C(43,4)
    C(43,4)
    11962+(11962*(1+0.466+0.466))+4680+299 ((11962+(11962*(1+0.466+0.466))+4680+299)*0.045+522)*(1+0.15+0.359)
    11962+(11962*(1+0.466+0.466))+4680+299 ((11962+(11962*(1+0.466+0.466))+4680+299)*0.045+522)*(1+0.15+0.359)
    11962+(11962*(1+0.468+0.468))+4680+299 ((11962+(11962*(1+0.468+0.468))+4680+299)*0.045+522)*(1+0.15+0.359)
    11962+(11962*(1+0.468+0.468))+4680+299
    11962+(11962*(1+0.468+0.468))+4680
    11/5+0.63÷（5/11）-2/5
    11/5*37%+63/100÷5/11-2/5
    11/5*1-2/5=
    -(400-100-57)+((25.4-0.2030×12-0.28×12)-(1.6+4)+3-7.65)*37＝
    -(400-100-57)+((25.4-0.2030×12-0.28×12)-(1.6+4)+3-7.65)*37＝
    200÷(sqrt(1＋2.65²)×sqrt(1＋100×2.65²))
    arctan26.5
    arctan26.5
    arctan2.65
    arctan10
    arctan10
    ½×3.14×50×1.65

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