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)
    2/tan(30)
    2/tan(20)
    2-6/13÷9/26-2/3
    -8.314*523*ln27.2
    (5,6-3,7+1,3-9,14)

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