!(-2)
    !(-1)
    !(20)
    !(10)
    !(7)
    ln0.2
    ln20
    2*sec(－π/4)*sec(－π/4)*cos(－π/4)
    2*sec(－π/4)*sec(－π/4)*cos(－π/4)
    -lg(2.2*10^-13)
    lg(2.2*10^-13)
    lg(2.2*10^-3)
    -3^2021
    0.78|1243539324578918340-029139740
    7890-89-079
    4/5*5*7
    log(2,10000000)
    (0.5×3×0.58×(25-15))/(2.98×(40.77-25))×1.3
    (0.5×3×0.58×(25-15))/(2.98×(40.77-25))×1.5
    2/tan(30)

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