(-102/((0.227)^2*11.9*10^(-3) ))^2*(0.034)^2
    (1/(0.227*11.9*10^(-3) ))^2*(9.3)^2
    sin(cos(tan(log(ln(7)))))
    sin(cos(tan(log(ln(1)))))
    [(102*0.017*10^3)/(0.227*11.9*11.9)]^2
    [(102*0.034*10^3)/(0.227*0.227*11.9)]^2
    [(9.3*10^3)/(0.227*11.9)]^2
    -(1×1×1×1)-16÷[(-2)×(-2)×(-2)]+2×(-1)
    -(1×1×1×1)-16÷[(-2)×(-2)]+2×(-1)
    -(1×1×1×1)
    sqrt(2.25*1.5^2+11.4*1.5+116.854)/0.176+138.889=
    4*(2/√3)
    4*(2/√3)-2/√3
    arcsin1
    C(20,21)
    C(21,20)
    A(21,20)/A(20,20)
    12*（1/3-1/4+1/2）
    1/3-1/4+1/2
    （141+6√3）/16

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