-37500+5700/(1+0.2)+12900/(1+0.2)^2+16300/(1+0.2）^3+27500/（1+0.2）^4
    180+arctan(0.5)-arctan(5)
     -37500+5700/(1+0.1)+12900/(1+0.1)^2+16300/(1+0.1）^3+27500/（1+0.1）^4
    -63000+11700/0.1*(1-1/1.1^9)
    (1/6)^(1/3)
    (1/6)^1/3
    (√6)^2
    arctan(1.25÷√(1+1.25×1.25))
    arctan1.25
    10.6-1.2
    (114514,1919810)
    1.1*40^2-0.055*40^3/3
    1/(0.0623*0.156)
    0.623/4
    2* √100/π *π
    2*√100/π*π
    arctan0.27
    sqrt(6)*atan(sqrt((1.5^2-1)/6))-atan(sqrt(1.5^2-1))-0.468
    sqrt(6)*atan(sqrt((1.5^2-1)/6))-atan(sqrt(1.5^2-1))
    sqrt(6)

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