2^2*3^2*4^2*5^2
    4.8^2
    log(2,1.2)
    （20.34-3.97）/20.34
    （20.34-5.46）/20.34
    （20.34-1.98）/20.34
    （20.34-4.46）/20.34
    （20.34-7.69）/20.34
    （29.76-8.18）/29.76
    （29.76-6.2）/29.76
    （29.76-3.72）/29.76
    （29.76-7.94）/29.76
    （29.76-8.68）/29.76
    tan60*300=
    0.27%^3
    0.27%^2*0.75%
    C(20,3)*(0.27%^3)*((1-0.27%)^(20-17))
    1*(0.027%^2*0.75%)*((1-0.027%^2*0.75%)^(20-3)*C(20,3)
    (0.027%^2*0.75%)*((1-0.027%^2*0.75%)^(20-3)*C(20,3)
    C(100,10)

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