（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)
    0.99^0.98-0.98^0.99
    -(-5)^3
    -(-5)^2
    -(5)^2
    (2/3)*(3-6)
    3*1*(2/3)-6*(2/3)
    -33.375252*1.8+331.613739
    330-33.3*0.237
    330-33.3*0.40
    330-33.3*0.59

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