158×(1-0.42)/(1-0.42*0.9)×1644/3600
    0.25×968.35[(0.9-1)+√((0.9-1)^2+(8×(0.9-0.5))/968.35)]
    158×(1-0.55)/(1-0.55*0.9)×915/3600
    0.25×968.35[(0.9-1)+√((0.9-1)^2+(8×(0.9-0.5))/968.35)]
    log(2,16384)
    log(2,2)
    (2904+1631.07×2+1835.37×2)/(2×24.2)
    20×3.0×2×24.2
    (1631.07×2+1835.37×2)/((248.665-20×3)×24.2)
    -4575*1.04
    12*[1−(1+4%)−(75.21−60)]/4%
    -381.25*1.04*12
    [1−(1+4%)−(75.21−60)]/4%
    -15.25/0.04
    20÷21.75×6500+100
    [1−(1+4%)−(75.21−60)]
    arctan1
    arctan1
    arctan2.13
    arctan2.13

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