54729/（1+18.7%）
    sin63
    sin63
    15305-3122.6-498.6-450-497-250-200=
    C(6,3)
    A(6,3)
    2300×0.2
    0.25^-3/2
    （25/9)^1/2-1-(64/27）^-2/3+0.25^-3/2
    （25/9)^1/2-1-(64/27）^-2/3+0.25^-3/2
    （25/9)^1/2-1-(64/27）^-2/3+0.25^-3/2
    (-3)^2*【-2/3+(-5/9)】-(-6)/4
    (-3)^2*2【-2/3+(-5/9)】-(-6)/4
    1802.42*（1+4.5%）^4
    tan45
    C(3,6)
    C(2,6)
    C(1,6)
    C(3,11)
    1/9899

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