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
    11700/0.2
    11700/0.08
    0.55*4.6^(-0.5)
    10.04*5/10/(600/3.6)

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