1615+80.75+80+220+21.5
    1615×5%
    53632112/23454.96=
    2220×23454.96×（1+0.03）=
    47×0.444=
    47×0.44=
    47×0.45=
    (218.15×10^3×836.4×10^3)/(32240×10^4×11.5)
    (307.68×10^3×10^3)/(1430×10^3 )
    (307.68×10^3×10^3)/(1.05×1430×10^3 )
    (450-18-18-13.5-13.5)/11.5
    ((150-11.5)/2-13.5)/18
    (28.01×10^3×58.4×10^3)/(712×10^4×5.5)
    (13.69×10^3×10^3)/(1.05×102×10^3 )
    C(95,5)
    (140-9.1-9.1-7.5-7.5)/5.5
    ((80-5.5)/2-7.5)/9.1
    -30-90
    arctan(5/π)
    （12*50%-4+0.8）/（12*50%-4+0.8-8*4.5%-5*7.5%/75%-2.5*3.6%）

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