4*0.7^3-30*0.7^2+34*0.7+40
    (600-400-200)*(1-25%)/8000
    arctan(sqrt(11.5/9.8-1))
    arctan(sqrt(11.5/9-1))
    arctan(sqrt(11.5/9)-1)
    sqrt（-9）
    3.14*17*17*10
    28.9*28.9*10
    28*28*10
    3.1415927*17.140741*17.140741*10
    17.140741*17.140741*10
    28.989795*28.989795*10
    !(100)
    2^29
    0.5*(1-0.9981287)
    50×(50+50×25)=
    (1-0.745355619821841)/(1-0.95578)
    (1-0.95578)/(1-0.745355619821841)
    1/(1-0.745355619821841)
    0.5*(1-0.745355619821841)

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