C(17,6)
    C(11,3)
    C(7,1)*C(6,3)*C(3,3)
    C(8,4)
    5/14*(14/25+28)
    4+1
    7/3*9+6+11/3
    600-50+350-100-279-19×4-18-16+400-139-29-18-18-135-55-10-80-29-39-8-13-89+300-6-60-15-15-36
    sqrt(4+64/9)
    sqrt(4+(8/3)^2)
    331*e^(-4/9.286688)
    arcsin0.589
    arcsin0.573
    2800-7.89−162.18−18.51−8.88−5.92
    4115226337448559670781893×27
    1949317738791423×19
    649772579597141×3
    1370+230*19-2000*1.05^18
    log（1.05，2.3）
    arcsin(-（√3）/2)

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