(1.4×3.14159/6)×（68.8×48.5^3/0.398）
    12×0.794×0.398/48.5
    0.8-(0.35×0.0024^0.68)
    -3.5-(-1.7)+2.8-5.3
    -3/1+2/1+6/5-1
    2.4/7.138
    4.3*1.66
    1.8/4.515
    （6097.6 *4 +6557.3）*3*4*20
    90-arctan(9.09/10)-arctan(9.09/2)
    20*lg(50/(10*sqrt(2)*sqrt(26)))
    20*lg(50/(2*sqrt(1.04)*sqrt(2)))
    50/(2*sqrt(1.04)*sqrt(2))
    （150-30）²/（5-1）
    -2.35/2+1
    (e^(-1)-e)
    -(1+(e^(-1)-e)/2)
    -(1+(e(-1)-e)/2)
    e0.1
    tan1.2

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