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)
    195/8*3.93/2.59
    6.03*8*15.06/34.85
    6.03*8*34.85/15.06
    1/(398804)^0.5
    0.5/(199402)^0.5
     0.4/1.003*10^6
    0.2/1.003*10^6
    0.5(19880.72)^(-0.5)
    20+25+30+35+40+......+515
    9.1+9.2+9.3+8.9+8.8+8.7+ (5.6×9.6×10.6) ÷(2.8×4.8×5.3)=
    9.1+9.2+9.3+8.9+8.8+8.7+ (5.6×9.6×10.6) -(2.8×4.8×5.3)=

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