x+1
    a/（5.76a+937.5+4464.3）=0.1
    x/（5.76x+937.5+4464.3）=0.1
    1.23^0.05
    （0.021*0.057^1.85+161.23）^0.05
    sqrt(645)
    ((110.8-110)*2+(109.4-110)*2+(111.2-110)*2+(109.5-110)*2+(109.1-110)*2)/5
    9000/(1-(1.09)^(-3))
    6000/(1-(1.06)^(-3))
    9000/0.2278
    1-0.7722
    1.09^(-3)
    100000*0.09
    9000/1-(1+0.09)^(-3)
    57.5*10^4*(1-(1.04)^(-5))/0.04
    6000*(1-(1.06)^(-5))/0.06
    9000/(1.09^3-1)
    1.09^3
    100000*0.01/(1-(1+0.01)^(360))
    arc tan0.25

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