-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)
    223/334*23
    17500/(1+11%)+16200/(1+11%)^2+13800/（1+11%）^3+7600/(1+11%)^4-37500
    5700/(1+11%)+12900/(1+11%)^2+16300/（1+11%）^3+27500/(1+11%)^4-37500

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