-(-2)^4-6*(-2)^3-13*(-2)^2-12*(-2)-2
    -(-3)^4-6*(-3)^3-13*(-3)^2-12*(-3)-2
    0.44*78.11/(0.44*78.11+0.56*92.13)
    9.08/0.54
    6.92/1.19
    114.0805*87.609/[8.314*(101.34+273.15)]
    108.685*80.957/[8.314*(87.46+273.15)]
    0.01*78.11+0.99*92.13
    0.025*78.11+0.975*92.13
    0.01*2.493/(1+1.493*0.01)
    0.8^(0.8125)-ln(0.8125)-1
    arctan（1/2.86）
    0.8^(0.875)-ln(0.875)-1
    0.8^(0.75)-ln(0.75)-1
    0.8^(0.5)-ln(0.5)-1
    ln(2.3125)-2/2.3125
    ln(2.375)-2/2.375
    ln(2.25)-2/2.25
    ln(2)-2/2
    ln(2.5)-2/2.5

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